diff --git a/inventory-backend/app/api/v1/inbound/buy.py b/inventory-backend/app/api/v1/inbound/buy.py
index 9c636c2..ec9bfe2 100644
--- a/inventory-backend/app/api/v1/inbound/buy.py
+++ b/inventory-backend/app/api/v1/inbound/buy.py
@@ -309,8 +309,11 @@ def delete_buy(id):
     try:
         material_name = BuyInboundService.delete_inbound(id)
         return jsonify({"code": 200, "msg": "删除成功", "material_name": material_name})
+    except ValueError as ve:
+        # 捕获业务拦截的报错，返回友好的 msg
+        return jsonify({"code": 400, "msg": str(ve)})
     except Exception as e:
-        return jsonify({"code": 500, "msg": str(e)}), 500
+        return jsonify({"code": 500, "msg": "服务器内部错误，请联系系统管理员"}), 500
 
 
 # ------------------------------------------------------------------
diff --git a/inventory-backend/app/services/inbound/buy_service.py b/inventory-backend/app/services/inbound/buy_service.py
index ad43f13..60d8e8e 100644
--- a/inventory-backend/app/services/inbound/buy_service.py
+++ b/inventory-backend/app/services/inbound/buy_service.py
@@ -4,6 +4,7 @@ from app.models.inbound.buy import StockBuy
 from app.models.base import MaterialBase
 from datetime import datetime, timedelta, timezone
 from sqlalchemy import or_, func, text, and_
+from sqlalchemy.exc import IntegrityError
 import traceback
 import json
 
@@ -285,6 +286,9 @@ class BuyInboundService:
             db.session.delete(stock)
             db.session.commit()
             return material_name
+        except IntegrityError:
+            db.session.rollback()
+            raise ValueError("该入库单已被出库、盘点或借还等业务关联，为保证账目完整，禁止删除！")
         except Exception as e:
             db.session.rollback()
             raise e