diff --git a/inventory-backend/app/api/v1/inbound/base.py b/inventory-backend/app/api/v1/inbound/base.py
index 6f9a5d5..7a0107e 100644
--- a/inventory-backend/app/api/v1/inbound/base.py
+++ b/inventory-backend/app/api/v1/inbound/base.py
@@ -276,6 +276,9 @@ def create():
             #     会被 _expand_operation_perms 前缀桥接放大给 material_list:operation。
             'productImageRemark': 'material_list:remark_edit',
             'manualLinkRemark': 'material_list:remark_edit',
+            # 采购链接：与读过滤 field_permissions.py 用**同一个码**，
+            # 避免「写用一个码、读用另一个码」再次造成读写错位。
+            'purchaseLink': 'material_list:purchaseLink',
             'referencePrice': 'material_list:referencePrice',
             'isEnabled': 'material_list:isEnabled'
         }
@@ -343,6 +346,9 @@ def update(id):
             #     会被 _expand_operation_perms 前缀桥接放大给 material_list:operation。
             'productImageRemark': 'material_list:remark_edit',
             'manualLinkRemark': 'material_list:remark_edit',
+            # 采购链接：与读过滤 field_permissions.py 用**同一个码**，
+            # 避免「写用一个码、读用另一个码」再次造成读写错位。
+            'purchaseLink': 'material_list:purchaseLink',
             'referencePrice': 'material_list:referencePrice',
             'isEnabled': 'material_list:isEnabled'
         }
diff --git a/inventory-backend/app/models/base.py b/inventory-backend/app/models/base.py
index 9456015..7e79ff9 100644
--- a/inventory-backend/app/models/base.py
+++ b/inventory-backend/app/models/base.py
@@ -33,6 +33,10 @@ class MaterialBase(db.Model):
     product_image_remark = db.Column(db.Text, default='', comment='产品图备注')
     manual_link_remark = db.Column(db.Text, default='', comment='说明书备注')
 
+    # 采购链接：补货时直接跳转的购买地址（淘宝 / 1688 等）。
+    # ★ 用 Text 而非 String(N)：外链常带很长的查询串，截断后会得到打不开的地址。
+    purchase_link = db.Column(db.Text, default='', comment='采购链接')
+
     # 启用状态
     is_enabled = db.Column(db.Boolean, default=True, index=True, comment='是否启用')  # ★ 状态过滤高频列
 
@@ -98,6 +102,7 @@ class MaterialBase(db.Model):
             'generalImage': parse_list(self.product_image),
             'productImageRemark': self.product_image_remark or '',
             'manualLinkRemark': self.manual_link_remark or '',
+            'purchaseLink': self.purchase_link or '',
             # 【核心修改】：直接返回布尔值，不再转成 1 或 0
             'isEnabled': bool(self.is_enabled),
             # 强制质检标记
diff --git a/inventory-backend/app/services/inbound/base_service.py b/inventory-backend/app/services/inbound/base_service.py
index a4a8e79..c03eeb9 100644
--- a/inventory-backend/app/services/inbound/base_service.py
+++ b/inventory-backend/app/services/inbound/base_service.py
@@ -622,6 +622,7 @@ class MaterialBaseService:
                 product_image=json.dumps(data.get('generalImage', [])),
                 product_image_remark=data.get('productImageRemark', ''),
                 manual_link_remark=data.get('manualLinkRemark', ''),
+                purchase_link=data.get('purchaseLink', ''),
                 reference_price=data.get('referencePrice'),
                 is_enabled=is_enabled_val
             )
@@ -668,6 +669,7 @@ class MaterialBaseService:
 
             if 'productImageRemark' in data: material.product_image_remark = data['productImageRemark']
             if 'manualLinkRemark' in data: material.manual_link_remark = data['manualLinkRemark']
+            if 'purchaseLink' in data: material.purchase_link = data['purchaseLink']
 
             if 'generalManual' in data:
                 material.manual_link = json.dumps(data['generalManual'])
diff --git a/inventory-backend/app/utils/field_permissions.py b/inventory-backend/app/utils/field_permissions.py
index 7cf3312..86ad289 100644
--- a/inventory-backend/app/utils/field_permissions.py
+++ b/inventory-backend/app/utils/field_permissions.py
@@ -18,6 +18,9 @@ STOCK_FIELD_RBAC_MAPPING = {
         "generalImage": "material_list:files", "generalManual": "material_list:files",
         "productImageRemark": "material_list:productImageRemark",
         "manualLinkRemark": "material_list:manualLinkRemark",
+        # 采购链接：读写**共用同一个码**（与 referencePrice 同模式）——
+        # 从根上避免「写用了 A 码、读用了 B 码」导致的口径错位。
+        "purchaseLink": "material_list:purchaseLink",
         "referencePrice": "material_list:referencePrice",
         "inventoryCount": "material_list:inventoryCount",
         "availableCount": "material_list:availableCount",