diff --git a/backend/internal/modules/chat/listing_group.go b/backend/internal/modules/chat/listing_group.go
index 2040f97..7e40ead 100644
--- a/backend/internal/modules/chat/listing_group.go
+++ b/backend/internal/modules/chat/listing_group.go
@@ -303,8 +303,40 @@ func checkQrCodeStockAndAlert(tx *gorm.DB, conversation *model.ChatConversation)
 
 	// 如果低于阈值,发送预警给所有客服
 	if count <= threshold {
-		// TODO: 发送站内信给所有 cs 角色客服
-		// 需要 notification 模块支持
+		// 查询所有 cs 角色的客服
+		var csAdmins []model.AdminUser
+		if err := tx.Table("admin_users").
+			Joins("JOIN admin_user_roles ON admin_users.id = admin_user_roles.admin_user_id").
+			Joins("JOIN roles ON admin_user_roles.role_id = roles.id").
+			Where("roles.code = ? AND admin_users.status = ?", "cs", "active").
+			Select("admin_users.id").
+			Find(&csAdmins).Error; err != nil {
+			return err
+		}
+
+		// 构造预警消息
+		alertContent := fmt.Sprintf("企业微信群二维码库存不足（剩余 %d 张），请及时补充", count)
+
+		// 发送站内信给所有客服
+		var entries []interface{}
+		for _, admin := range csAdmins {
+			entries = append(entries, map[string]interface{}{
+				"admin_user_id": admin.ID,
+				"type":          "system",
+				"title":         "二维码库存预警",
+				"content":       alertContent,
+				"is_read":       false,
+				"created_at":    time.Now(),
+				"updated_at":    time.Now(),
+			})
+		}
+
+		if len(entries) > 0 {
+			// 批量插入通知
+			if err := tx.Table("admin_notifications").Create(entries).Error; err != nil {
+				return err
+			}
+		}
 	}
 
 	return nil