diff --git a/tkpurchase/api/controllers/scheduleController.js b/tkpurchase/api/controllers/scheduleController.js
index 7480aaf..7a75eda 100644
--- a/tkpurchase/api/controllers/scheduleController.js
+++ b/tkpurchase/api/controllers/scheduleController.js
@@ -198,14 +198,17 @@ async function updateStatus(req, res) {
   }
 }
 
-// 일정 삭제
+// 일정 삭제 (admin 전용, 관련 데이터 캐스케이드 삭제)
 async function deleteSchedule(req, res) {
   try {
-    await scheduleModel.deleteSchedule(req.params.id);
+    const result = await scheduleModel.deleteSchedule(req.params.id);
+    if (result === null) {
+      return res.status(404).json({ success: false, error: '일정을 찾을 수 없습니다' });
+    }
     res.json({ success: true, message: '삭제 완료' });
   } catch (err) {
     console.error('Schedule delete error:', err);
-    res.status(500).json({ success: false, error: err.message });
+    res.status(500).json({ success: false, error: '일정 삭제 중 오류가 발생했습니다' });
   }
 }
 
diff --git a/tkpurchase/api/models/scheduleModel.js b/tkpurchase/api/models/scheduleModel.js
index fc01e0c..9e360c5 100644
--- a/tkpurchase/api/models/scheduleModel.js
+++ b/tkpurchase/api/models/scheduleModel.js
@@ -113,8 +113,25 @@ async function updateStatus(id, status) {
 }
 
 async function deleteSchedule(id) {
+  const schedule = await findById(id);
+  if (!schedule) return null;
+
   const db = getPool();
-  await db.query('DELETE FROM partner_schedules WHERE id = ?', [id]);
+  const conn = await db.getConnection();
+  try {
+    await conn.beginTransaction();
+    await conn.query('DELETE FROM partner_work_reports WHERE schedule_id = ?', [id]);
+    await conn.query('DELETE FROM partner_work_checkins WHERE schedule_id = ?', [id]);
+    await conn.query("DELETE FROM safety_education_reports WHERE target_type = 'partner_schedule' AND target_id = ?", [id]);
+    await conn.query('DELETE FROM partner_schedules WHERE id = ?', [id]);
+    await conn.commit();
+    return true;
+  } catch (err) {
+    await conn.rollback();
+    throw err;
+  } finally {
+    conn.release();
+  }
 }
 
 async function findActiveByCompany(companyId) {
diff --git a/tkpurchase/api/routes/scheduleRoutes.js b/tkpurchase/api/routes/scheduleRoutes.js
index da4da61..51a4dd6 100644
--- a/tkpurchase/api/routes/scheduleRoutes.js
+++ b/tkpurchase/api/routes/scheduleRoutes.js
@@ -1,6 +1,6 @@
 const express = require('express');
 const router = express.Router();
-const { requireAuth, requirePage } = require('../middleware/auth');
+const { requireAuth, requireAdmin, requirePage } = require('../middleware/auth');
 const ctrl = require('../controllers/scheduleController');
 
 router.use(requireAuth);
@@ -14,6 +14,6 @@ router.put('/:id', requirePage('purchasing_schedule'), ctrl.update);
 router.put('/:id/status', requirePage('purchasing_schedule'), ctrl.updateStatus);
 router.put('/:id/approve', requirePage('purchasing_schedule'), ctrl.approveRequest);
 router.put('/:id/reject', requirePage('purchasing_schedule'), ctrl.rejectRequest);
-router.delete('/:id', requirePage('purchasing_schedule'), ctrl.deleteSchedule);
+router.delete('/:id', requireAdmin, ctrl.deleteSchedule);
 
 module.exports = router;
diff --git a/tkpurchase/web/static/js/tkpurchase-schedule.js b/tkpurchase/web/static/js/tkpurchase-schedule.js
index 9652b13..bc6029d 100644
--- a/tkpurchase/web/static/js/tkpurchase-schedule.js
+++ b/tkpurchase/web/static/js/tkpurchase-schedule.js
@@ -77,6 +77,7 @@ function renderScheduleTable(list, total) {
 
     tbody.innerHTML = list.map(s => {
         const [cls, label] = statusMap[s.status] || ['badge-gray', s.status];
+        const isAdmin = currentUser && (currentUser.role === 'admin' || currentUser.role === 'system');
         const canEdit = s.status === 'scheduled';
         const isRequest = s.status === 'requested';
         const projectLabel = s.project_name ? (s.job_no ? `[${s.job_no}] ${s.project_name}` : s.project_name) : '';
@@ -91,8 +92,8 @@ function renderScheduleTable(list, total) {
             <td class="text-right">
                 ${isRequest ? `<button onclick="openApproveModal(${s.id})" class="text-amber-600 hover:text-amber-800 text-xs mr-1 font-medium" title="승인/반려"><i class="fas fa-check-circle mr-1"></i>처리</button>` : ''}
                 ${(s.status === 'in_progress' || s.status === 'completed') ? `<button onclick="viewCheckins(${s.id})" class="text-emerald-600 hover:text-emerald-800 text-xs mr-1" title="체크인 현황"><i class="fas fa-clipboard-check"></i></button>` : ''}
-                ${canEdit ? `<button onclick="openEditSchedule(${s.id})" class="text-blue-600 hover:text-blue-800 text-xs mr-1" title="수정"><i class="fas fa-edit"></i></button>
-                <button onclick="deleteSchedule(${s.id})" class="text-red-500 hover:text-red-700 text-xs" title="삭제"><i class="fas fa-trash"></i></button>` : ''}
+                ${canEdit ? `<button onclick="openEditSchedule(${s.id})" class="text-blue-600 hover:text-blue-800 text-xs mr-1" title="수정"><i class="fas fa-edit"></i></button>` : ''}
+                ${isAdmin ? `<button onclick="deleteSchedule(${s.id})" class="text-red-500 hover:text-red-700 text-xs" title="삭제"><i class="fas fa-trash"></i></button>` : ''}
             </td>
         </tr>`;
     }).join('');
@@ -285,7 +286,7 @@ async function submitEditSchedule(e) {
 
 /* ===== Delete Schedule ===== */
 async function deleteSchedule(id) {
-    if (!confirm('이 일정을 삭제하시겠습니까?')) return;
+    if (!confirm('이 일정을 삭제하시겠습니까?\n\n⚠️ 관련 체크인·작업보고서·안전교육 기록이 모두 삭제됩니다.')) return;
     try {
         await api('/schedules/' + id, { method: 'DELETE' });
         showToast('일정이 삭제되었습니다');