diff --git a/backend/src/main/java/com/designhub/service/TaskItemService.java b/backend/src/main/java/com/designhub/service/TaskItemService.java
index 5c17851..bf2c53b 100644
--- a/backend/src/main/java/com/designhub/service/TaskItemService.java
+++ b/backend/src/main/java/com/designhub/service/TaskItemService.java
@@ -999,11 +999,32 @@ public class TaskItemService {
         boolean isAdmin = rejector != null && Integer.valueOf(1).equals(rejector.getIsAdmin());
         
         if (!isAdmin) {
-            if (mainTask.getReceiverDeptId() == null) {
-                throw new BusinessException(ResultCode.FORBIDDEN, "任务未指定接单部门");
+            boolean hasPermission = false;
+            
+            if (mainTask.getReceiverDeptId() != null) {
+                // 如果任务已指定接单部门，检查用户是否是该部门的负责人
+                com.designhub.entity.Department receiverDept = departmentMapper.selectById(mainTask.getReceiverDeptId());
+                if (receiverDept != null && rejectorId.equals(receiverDept.getLeaderId())) {
+                    hasPermission = true;
+                    log.info("用户 {} 是任务接单部门 {} 的负责人", rejectorId, mainTask.getReceiverDeptId());
+                }
+            } else {
+                // 如果任务未指定接单部门，检查用户是否是任何接单部门的负责人
+                List<com.designhub.entity.Department> receivingDepts = departmentMapper.selectList(
+                    new LambdaQueryWrapper<com.designhub.entity.Department>()
+                        .eq(com.designhub.entity.Department::getLeaderId, rejectorId)
+                        .eq(com.designhub.entity.Department::getDeptType, "receiving")
+                        .eq(com.designhub.entity.Department::getStatus, 1)
+                        .eq(com.designhub.entity.Department::getDeleted, 0)
+                );
+                if (!receivingDepts.isEmpty()) {
+                    hasPermission = true;
+                    log.info("用户 {} 是接单部门负责人（管理的接单部门：{}），允许驳回未指定接单部门的任务", 
+                        rejectorId, receivingDepts.stream().map(com.designhub.entity.Department::getDeptName).collect(java.util.stream.Collectors.toList()));
+                }
             }
-            com.designhub.entity.Department receiverDept = departmentMapper.selectById(mainTask.getReceiverDeptId());
-            if (receiverDept == null || !rejectorId.equals(receiverDept.getLeaderId())) {
+            
+            if (!hasPermission) {
                 throw new BusinessException(ResultCode.FORBIDDEN, "只有接单部门负责人可以驳回子任务组");
             }
         } else {