diff --git a/backend-node/src/controllers/dataflowController.ts b/backend-node/src/controllers/dataflowController.ts
index e516b5ce..57a0c3ea 100644
--- a/backend-node/src/controllers/dataflowController.ts
+++ b/backend-node/src/controllers/dataflowController.ts
@@ -826,3 +826,54 @@ export async function deleteDiagram(
     res.status(500).json(response);
   }
 }
+
+/**
+ * relationship_id로 관계도 관계 조회
+ */
+export async function getDiagramRelationshipsByRelationshipId(
+  req: AuthenticatedRequest,
+  res: Response
+): Promise<void> {
+  try {
+    const { relationshipId } = req.params;
+    const companyCode = (req.user as any)?.company_code || "*";
+
+    if (!relationshipId) {
+      const response: ApiResponse<null> = {
+        success: false,
+        message: "관계 ID가 필요합니다.",
+        error: {
+          code: "MISSING_RELATIONSHIP_ID",
+          details: "relationshipId 파라미터가 필요합니다.",
+        },
+      };
+      res.status(400).json(response);
+      return;
+    }
+
+    const dataflowService = new DataflowService();
+    const relationships = await dataflowService.getDiagramRelationshipsByRelationshipId(
+      companyCode,
+      parseInt(relationshipId)
+    );
+
+    const response: ApiResponse<any[]> = {
+      success: true,
+      message: "관계도 관계 목록을 성공적으로 조회했습니다.",
+      data: relationships,
+    };
+
+    res.status(200).json(response);
+  } catch (error) {
+    logger.error("관계도 관계 조회 실패:", error);
+    const response: ApiResponse<null> = {
+      success: false,
+      message: "관계도 관계 조회에 실패했습니다.",
+      error: {
+        code: "DIAGRAM_RELATIONSHIPS_FETCH_FAILED",
+        details: error instanceof Error ? error.message : "알 수 없는 오류가 발생했습니다.",
+      },
+    };
+    res.status(500).json(response);
+  }
+}
diff --git a/backend-node/src/routes/dataflowRoutes.ts b/backend-node/src/routes/dataflowRoutes.ts
index 21c9bc3f..ddb87a17 100644
--- a/backend-node/src/routes/dataflowRoutes.ts
+++ b/backend-node/src/routes/dataflowRoutes.ts
@@ -12,6 +12,7 @@ import {
   getTableData,
   getDataFlowDiagrams,
   getDiagramRelationships,
+  getDiagramRelationshipsByRelationshipId,
   copyDiagram,
   deleteDiagram,
 } from "../controllers/dataflowController";
@@ -108,4 +109,10 @@ router.post("/diagrams/:diagramName/copy", copyDiagram);
  */
 router.delete("/diagrams/:diagramName", deleteDiagram);
 
+// relationship_id로 관계도 관계 조회
+router.get(
+  "/relationships/:relationshipId/diagram",
+  getDiagramRelationshipsByRelationshipId
+);
+
 export default router;
diff --git a/backend-node/src/services/dataflowService.ts b/backend-node/src/services/dataflowService.ts
index 3958b109..e188a4cf 100644
--- a/backend-node/src/services/dataflowService.ts
+++ b/backend-node/src/services/dataflowService.ts
@@ -776,6 +776,7 @@ export class DataflowService {
       const relationships = await prisma.table_relationships.findMany({
         where: whereCondition,
         select: {
+          relationship_id: true,
           relationship_name: true,
           from_table_name: true,
           to_table_name: true,
@@ -797,6 +798,7 @@ export class DataflowService {
 
         if (!diagramMap.has(diagramName)) {
           diagramMap.set(diagramName, {
+            relationshipId: rel.relationship_id, // 첫 번째 관계의 ID를 대표 ID로 사용
             diagramName: diagramName,
             connectionType: rel.connection_type,
             relationshipType: rel.relationship_type,
@@ -998,4 +1000,59 @@ export class DataflowService {
       throw error;
     }
   }
+
+  /**
+   * relationship_id로 해당 관계도의 모든 관계 조회
+   */
+  async getDiagramRelationshipsByRelationshipId(
+    companyCode: string,
+    relationshipId: number
+  ) {
+    try {
+      logger.info(
+        `DataflowService: relationship_id로 관계도 관계 조회 - ${relationshipId}`
+      );
+
+      // 먼저 해당 relationship_id의 관계도명을 찾음
+      const targetRelationship = await prisma.table_relationships.findFirst({
+        where: {
+          relationship_id: relationshipId,
+          company_code: companyCode,
+          is_active: "Y",
+        },
+        select: {
+          relationship_name: true,
+        },
+      });
+
+      if (!targetRelationship) {
+        throw new Error("해당 관계 ID를 찾을 수 없습니다.");
+      }
+
+      // 같은 관계도명을 가진 모든 관계 조회
+      const relationships = await prisma.table_relationships.findMany({
+        where: {
+          relationship_name: targetRelationship.relationship_name,
+          company_code: companyCode,
+          is_active: "Y",
+        },
+        orderBy: [{ relationship_id: "asc" }],
+      });
+
+      logger.info(
+        `DataflowService: relationship_id로 관계도 관계 조회 완료 - ${relationships.length}개 관계`
+      );
+
+      return relationships.map((rel) => ({
+        ...rel,
+        settings: rel.settings as any,
+      }));
+    } catch (error) {
+      logger.error(
+        `DataflowService: relationship_id로 관계도 관계 조회 실패 - ${relationshipId}`,
+        error
+      );
+      throw error;
+    }
+  }
 }
diff --git a/frontend/app/(main)/admin/dataflow/edit/[relationshipId]/page.tsx b/frontend/app/(main)/admin/dataflow/edit/[relationshipId]/page.tsx
new file mode 100644
index 00000000..ff6fc87b
--- /dev/null
+++ b/frontend/app/(main)/admin/dataflow/edit/[relationshipId]/page.tsx
@@ -0,0 +1,85 @@
+"use client";
+
+import { useParams, useRouter } from "next/navigation";
+import { useState, useEffect } from "react";
+import { ArrowLeft } from "lucide-react";
+import { Button } from "@/components/ui/button";
+import { DataFlowDesigner } from "@/components/dataflow/DataFlowDesigner";
+import { DataFlowAPI } from "@/lib/api/dataflow";
+import { toast } from "sonner";
+
+export default function DataFlowEditPage() {
+  const params = useParams();
+  const router = useRouter();
+  const [relationshipId, setRelationshipId] = useState<string>("");
+  const [diagramName, setDiagramName] = useState<string>("");
+
+  useEffect(() => {
+    if (params.relationshipId) {
+      // URL에서 relationship_id 설정
+      const id = params.relationshipId as string;
+      setRelationshipId(id);
+
+      // relationship_id로 관계도명 조회
+      const fetchDiagramName = async () => {
+        try {
+          const relationships = await DataFlowAPI.getDiagramRelationshipsByRelationshipId(id);
+          if (relationships.length > 0) {
+            setDiagramName(relationships[0].relationship_name);
+          } else {
+            setDiagramName(`관계도 ID: ${id}`);
+          }
+        } catch (error) {
+          console.error("관계도명 조회 실패:", error);
+          setDiagramName(`관계도 ID: ${id}`);
+        }
+      };
+
+      fetchDiagramName();
+    }
+  }, [params.relationshipId]);
+
+  const handleBackToList = () => {
+    router.push("/admin/dataflow");
+  };
+
+  if (!relationshipId || !diagramName) {
+    return (
+      <div className="flex h-64 items-center justify-center">
+        <div className="text-center">
+          <div className="mx-auto mb-4 h-8 w-8 animate-spin rounded-full border-b-2 border-blue-600"></div>
+          <p className="text-gray-500">관계도 정보를 불러오는 중...</p>
+        </div>
+      </div>
+    );
+  }
+
+  return (
+    <div className="space-y-6">
+      {/* 헤더 */}
+      <div className="flex items-center justify-between">
+        <div className="flex items-center space-x-4">
+          <Button variant="outline" size="sm" onClick={handleBackToList} className="flex items-center space-x-2">
+            <ArrowLeft className="h-4 w-4" />
+            <span>목록으로</span>
+          </Button>
+          <div>
+            <h1 className="text-2xl font-bold text-gray-900">📊 관계도 편집</h1>
+            <p className="mt-1 text-gray-600">
+              <span className="font-medium text-blue-600">{diagramName}</span> 관계도를 편집하고 있습니다
+            </p>
+          </div>
+        </div>
+      </div>
+
+      {/* 데이터플로우 디자이너 */}
+      <div className="rounded-lg border border-gray-200 bg-white">
+        <DataFlowDesigner
+          selectedDiagram={diagramName}
+          relationshipId={relationshipId}
+          onBackToList={handleBackToList}
+        />
+      </div>
+    </div>
+  );
+}
diff --git a/frontend/app/(main)/admin/dataflow/page.tsx b/frontend/app/(main)/admin/dataflow/page.tsx
index 65b049b5..29a3aea3 100644
--- a/frontend/app/(main)/admin/dataflow/page.tsx
+++ b/frontend/app/(main)/admin/dataflow/page.tsx
@@ -1,6 +1,7 @@
 "use client";
 
 import { useState } from "react";
+import { useRouter } from "next/navigation";
 import { DataFlowDesigner } from "@/components/dataflow/DataFlowDesigner";
 import DataFlowList from "@/components/dataflow/DataFlowList";
 import { TableRelationship, DataFlowDiagram } from "@/lib/api/dataflow";
@@ -12,6 +13,7 @@ type Step = "list" | "design";
 
 export default function DataFlowPage() {
   const { user } = useAuth();
+  const router = useRouter();
   const [currentStep, setCurrentStep] = useState<Step>("list");
   const [selectedDiagram, setSelectedDiagram] = useState<DataFlowDiagram | null>(null);
   const [stepHistory, setStepHistory] = useState<Step[]>(["list"]);
@@ -79,8 +81,14 @@ export default function DataFlowPage() {
   };
 
   const handleDesignDiagram = (diagram: DataFlowDiagram | null) => {
-    setSelectedDiagram(diagram);
-    goToNextStep("design");
+    if (diagram) {
+      // 기존 관계도 편집 - 새로운 URL로 이동
+      router.push(`/admin/dataflow/edit/${diagram.relationshipId}`);
+    } else {
+      // 새 관계도 생성 - 현재 페이지에서 처리
+      setSelectedDiagram(null);
+      goToNextStep("design");
+    }
   };
 
   return (
diff --git a/frontend/components/dataflow/DataFlowDesigner.tsx b/frontend/components/dataflow/DataFlowDesigner.tsx
index 2c8f4c7a..119fd8dd 100644
--- a/frontend/components/dataflow/DataFlowDesigner.tsx
+++ b/frontend/components/dataflow/DataFlowDesigner.tsx
@@ -50,16 +50,18 @@ const nodeTypes = {
 const edgeTypes = {};
 
 interface DataFlowDesignerProps {
-  companyCode: string;
+  companyCode?: string;
   onSave?: (relationships: TableRelationship[]) => void;
-  selectedDiagram?: DataFlowDiagram | null;
+  selectedDiagram?: DataFlowDiagram | string | null;
+  relationshipId?: string;
   onBackToList?: () => void;
 }
 
 // TableRelationship 타입은 dataflow.ts에서 import
 
 export const DataFlowDesigner: React.FC<DataFlowDesignerProps> = ({
-  companyCode,
+  companyCode = "*",
+  relationshipId,
   onSave,
   selectedDiagram,
   onBackToList, // eslint-disable-line @typescript-eslint/no-unused-vars
@@ -167,12 +169,14 @@ export const DataFlowDesigner: React.FC<DataFlowDesignerProps> = ({
 
   // 선택된 관계도의 관계 로드
   const loadSelectedDiagramRelationships = useCallback(async () => {
-    if (!selectedDiagram) return;
+    if (!relationshipId) return;
 
     try {
-      console.log("🔍 관계도 로드 시작:", selectedDiagram.diagramName);
+      console.log("🔍 관계도 로드 시작 (relationshipId):", relationshipId);
       toast.loading("관계도를 불러오는 중...", { id: "load-diagram" });
-      const diagramRelationships = await DataFlowAPI.getDiagramRelationships(selectedDiagram.diagramName);
+
+      // relationshipId로 해당 관계도의 모든 관계 조회
+      const diagramRelationships = await DataFlowAPI.getDiagramRelationshipsByRelationshipId(relationshipId);
       console.log("📋 관계도 관계 데이터:", diagramRelationships);
       console.log("📋 첫 번째 관계 상세:", diagramRelationships[0]);
       console.log(
@@ -320,12 +324,12 @@ export const DataFlowDesigner: React.FC<DataFlowDesignerProps> = ({
       console.log("🔗 생성된 관계 에지 수:", relationshipEdges.length);
       console.log("📍 관계 에지 상세:", relationshipEdges);
       setEdges(relationshipEdges);
-      toast.success(`"${selectedDiagram.diagramName}" 관계도를 불러왔습니다.`, { id: "load-diagram" });
+      toast.success("관계도를 불러왔습니다.", { id: "load-diagram" });
     } catch (error) {
       console.error("선택된 관계도 로드 실패:", error);
       toast.error("관계도를 불러오는데 실패했습니다.", { id: "load-diagram" });
     }
-  }, [selectedDiagram, setNodes, setEdges, selectedColumns, handleColumnClick]);
+  }, [relationshipId, setNodes, setEdges, selectedColumns, handleColumnClick]);
 
   // 기존 관계 로드 (새 관계도 생성 시)
   const loadExistingRelationships = useCallback(async () => {
@@ -387,13 +391,13 @@ export const DataFlowDesigner: React.FC<DataFlowDesignerProps> = ({
   // 컴포넌트 마운트 시 관계 로드
   useEffect(() => {
     if (companyCode) {
-      if (selectedDiagram) {
+      if (relationshipId) {
         loadSelectedDiagramRelationships();
       } else {
         loadExistingRelationships();
       }
     }
-  }, [companyCode, selectedDiagram, loadExistingRelationships, loadSelectedDiagramRelationships]);
+  }, [companyCode, relationshipId, loadExistingRelationships, loadSelectedDiagramRelationships]);
 
   // 노드 선택 변경 핸들러
   const onSelectionChange = useCallback(({ nodes }: { nodes: Node<TableNodeData>[] }) => {
diff --git a/frontend/lib/api/dataflow.ts b/frontend/lib/api/dataflow.ts
index 2eee2398..6678c59d 100644
--- a/frontend/lib/api/dataflow.ts
+++ b/frontend/lib/api/dataflow.ts
@@ -89,6 +89,7 @@ export interface TableDataResponse {
 
 // 관계도 정보 인터페이스
 export interface DataFlowDiagram {
+  relationshipId: number;
   diagramName: string;
   connectionType: string;
   relationshipType: string;
@@ -377,7 +378,7 @@ export class DataFlowAPI {
     }
   }
 
-  // 특정 관계도의 모든 관계 조회
+  // 특정 관계도의 모든 관계 조회 (관계도명으로)
   static async getDiagramRelationships(diagramName: string): Promise<TableRelationship[]> {
     try {
       const encodedDiagramName = encodeURIComponent(diagramName);
@@ -433,4 +434,22 @@ export class DataFlowAPI {
       throw error;
     }
   }
+
+  // 특정 관계도의 모든 관계 조회 (relationship_id로)
+  static async getDiagramRelationshipsByRelationshipId(relationshipId: string): Promise<TableRelationship[]> {
+    try {
+      const response = await apiClient.get<ApiResponse<TableRelationship[]>>(
+        `/dataflow/relationships/${relationshipId}/diagram`,
+      );
+
+      if (!response.data.success) {
+        throw new Error(response.data.message || "관계도 관계 조회에 실패했습니다.");
+      }
+
+      return response.data.data || [];
+    } catch (error) {
+      console.error("관계도 관계 조회 오류:", error);
+      throw error;
+    }
+  }
 }