diff --git a/klp-wms/src/main/java/com/klp/controller/WmsApprovalController.java b/klp-wms/src/main/java/com/klp/controller/WmsApprovalController.java
index 62f50a9a..aa13c246 100644
--- a/klp-wms/src/main/java/com/klp/controller/WmsApprovalController.java
+++ b/klp-wms/src/main/java/com/klp/controller/WmsApprovalController.java
@@ -142,4 +142,18 @@ public class WmsApprovalController extends BaseController {
     public R<List<WmsApprovalTaskVo>> getTasks(@PathVariable Long approvalId) {
         return R.ok(iWmsApprovalTaskService.queryByApprovalId(approvalId));
     }
+
+    /**
+     * 撤销审批
+     *
+     * @param approvalId 审批ID
+     */
+    @Log(title = "撤销审批", businessType = BusinessType.UPDATE)
+    @RepeatSubmit()
+    @PostMapping("/cancel")
+    public R<Map<String, Object>> cancelApproval(
+        @NotNull(message = "审批ID不能为空")
+        @RequestParam Long approvalId) {
+        return R.ok(iWmsApprovalService.cancelApproval(approvalId));
+    }
 }
diff --git a/klp-wms/src/main/java/com/klp/service/IWmsApprovalService.java b/klp-wms/src/main/java/com/klp/service/IWmsApprovalService.java
index 9dd7ec2b..a4ab6545 100644
--- a/klp-wms/src/main/java/com/klp/service/IWmsApprovalService.java
+++ b/klp-wms/src/main/java/com/klp/service/IWmsApprovalService.java
@@ -65,4 +65,12 @@ public interface IWmsApprovalService {
      * @return 操作结果
      */
     Map<String, Object> rejectTask(Long taskId, String approvalOpinion);
+
+    /**
+     * 撤销审批
+     *
+     * @param approvalId 审批ID
+     * @return 操作结果
+     */
+    Map<String, Object> cancelApproval(Long approvalId);
 }
diff --git a/klp-wms/src/main/java/com/klp/service/IWmsApprovalTaskService.java b/klp-wms/src/main/java/com/klp/service/IWmsApprovalTaskService.java
index fb9b19c7..03ca4597 100644
--- a/klp-wms/src/main/java/com/klp/service/IWmsApprovalTaskService.java
+++ b/klp-wms/src/main/java/com/klp/service/IWmsApprovalTaskService.java
@@ -31,4 +31,12 @@ public interface IWmsApprovalTaskService {
     Boolean deleteWithValidByIds(Collection<Long> ids, Boolean isValid);
 
     List<WmsApprovalTaskVo> queryByApprovalId(Long approvalId);
+
+    /**
+     * 根据审批ID删除所有相关任务
+     *
+     * @param approvalId 审批ID
+     * @return 删除数量
+     */
+    Integer deleteByApprovalId(Long approvalId);
 }
diff --git a/klp-wms/src/main/java/com/klp/service/impl/WmsApprovalServiceImpl.java b/klp-wms/src/main/java/com/klp/service/impl/WmsApprovalServiceImpl.java
index 291b0ed9..801ee225 100644
--- a/klp-wms/src/main/java/com/klp/service/impl/WmsApprovalServiceImpl.java
+++ b/klp-wms/src/main/java/com/klp/service/impl/WmsApprovalServiceImpl.java
@@ -47,6 +47,7 @@ public class WmsApprovalServiceImpl implements IWmsApprovalService {
 
     private final WmsApprovalMapper baseMapper;
     private final WmsApprovalTaskMapper approvalTaskMapper;
+    private final IWmsApprovalTaskService approvalTaskService;
     private final WmsLeaveRequestMapper leaveRequestMapper;
     private final WmsOutRequestMapper outRequestMapper;
     private final ISysUserService userService;
@@ -499,4 +500,53 @@ public class WmsApprovalServiceImpl implements IWmsApprovalService {
         return result;
     }
 
+    @Override
+    @Transactional(rollbackFor = Exception.class)
+    public Map<String, Object> cancelApproval(Long approvalId) {
+        Map<String, Object> result = new HashMap<>();
+        result.put("success", false);
+
+        if (approvalId == null) {
+            result.put("message", "审批ID不能为空");
+            return result;
+        }
+
+        WmsApproval approval = baseMapper.selectById(approvalId);
+        if (approval == null) {
+            result.put("message", "审批记录不存在");
+            return result;
+        }
+
+        if ("已撤销".equals(approval.getApprovalStatus())) {
+            result.put("message", "该审批已被撤销");
+            return result;
+        }
+
+        if ("已同意".equals(approval.getApprovalStatus())) {
+            result.put("message", "已通过的审批不能撤销");
+            return result;
+        }
+
+        List<WmsApprovalTaskVo> tasks = approvalTaskService.queryByApprovalId(approvalId);
+        if (tasks != null && !tasks.isEmpty()) {
+            for (WmsApprovalTaskVo task : tasks) {
+                if (task.getTaskStatus() != null && !"pending".equals(task.getTaskStatus())) {
+                    result.put("message", "该审批已被审批，不能撤销（审批人：" + task.getApproverName() + "，状态：" + task.getTaskStatus() + "）");
+                    return result;
+                }
+            }
+        }
+
+        Integer deletedCount = approvalTaskService.deleteByApprovalId(approvalId);
+
+        approval.setApprovalStatus("已撤销");
+        approval.setFinalStatus("cancelled");
+        baseMapper.updateById(approval);
+
+        result.put("success", true);
+        result.put("message", "撤销成功");
+        result.put("deletedTaskCount", deletedCount);
+        return result;
+    }
+
 }
diff --git a/klp-wms/src/main/java/com/klp/service/impl/WmsApprovalTaskServiceImpl.java b/klp-wms/src/main/java/com/klp/service/impl/WmsApprovalTaskServiceImpl.java
index 35a99fa7..df1759a2 100644
--- a/klp-wms/src/main/java/com/klp/service/impl/WmsApprovalTaskServiceImpl.java
+++ b/klp-wms/src/main/java/com/klp/service/impl/WmsApprovalTaskServiceImpl.java
@@ -201,4 +201,10 @@ public class WmsApprovalTaskServiceImpl implements IWmsApprovalTaskService {
             .eq(WmsApprovalTask::getApprovalId, approvalId)
             .orderByAsc(WmsApprovalTask::getCreateTime));
     }
+
+    @Override
+    public Integer deleteByApprovalId(Long approvalId) {
+        return baseMapper.delete(Wrappers.<WmsApprovalTask>lambdaQuery()
+            .eq(WmsApprovalTask::getApprovalId, approvalId));
+    }
 }