diff --git a/app/modules/dispatch/export.py b/app/modules/dispatch/export.py
index 4399c29..2fbddfd 100644
--- a/app/modules/dispatch/export.py
+++ b/app/modules/dispatch/export.py
@@ -47,6 +47,19 @@ def export_filename(*, dispatch_date: str, platform: str) -> str:
     return f"{stamp}_{suffix}.xlsx"
 
 
+def split_sku(seller_sku: str) -> tuple[str, int]:
+    """seller_sku → (아이템코드, 배수).
+
+    끝의 `_<숫자>` 는 '같은 상품 N개'를 뜻한다(예: MT-0320_3 → 코드 MT-0320, 3개).
+    접미사가 없으면 배수 1.
+    """
+    s = (seller_sku or "").strip()
+    m = re.search(r"_(\d+)$", s)
+    if m:
+        return s[: m.start()], int(m.group(1))
+    return s, 1
+
+
 def resolve_product_name(seller_sku: str, name_map: dict[str, str], fallback: str = "") -> str:
     """아이템코드(seller_sku)로 itemcode_db 상품명을 찾는다.
 
@@ -107,11 +120,13 @@ def build_workbook_bytes(
         for it in items:
             row_data = dict(box)
             sku = it.get("seller_sku", "") or ""
+            base_code, mult = split_sku(sku)
             row_data["product_name"] = resolve_product_name(
-                sku, name_map, fallback=it.get("product_name", "") or ""
+                base_code, name_map, fallback=it.get("product_name", "") or ""
             )
-            row_data["seller_sku"] = sku
-            row_data["quantity"] = it.get("quantity", "") if it.get("quantity") is not None else ""
+            row_data["seller_sku"] = base_code  # 접미사(_N) 제거한 실제 아이템코드
+            qty = it.get("quantity")
+            row_data["quantity"] = (int(qty) * mult) if qty is not None else ""
             ws.append([_cell(row_data.get(key, "")) for _, key in _COLUMNS])
 
     _autosize(ws, headers)