diff --git a/action_executor.py b/action_executor.py
index 7f1a0fc..5c33127 100644
--- a/action_executor.py
+++ b/action_executor.py
@@ -28,6 +28,7 @@ class ActionExecutor:
             "place_entity": self.place_entity, "place_belt_line": self.place_belt_line,
             "insert_to_entity": self.insert_to_entity, "set_recipe": self.set_recipe,
             "start_research": self.start_research, "wait": self.wait,
+            "build_smelting_line": self.build_smelting_line,
         }
         handler = handlers.get(act)
         if not handler:
@@ -454,6 +455,54 @@ p.mining_state = {{mining = true, position = {{x = {mine_x}, y = {mine_y}}}}}
             return True, f"{ore} {total_mined}개 채굴 (목표 {count}개 중 일부)"
         return False, f"{ore} 채굴 실패 - {len(failed_positions)}개 타일 접근 불가"
 
+    # ── 건설 자동화 (Blueprint) ───────────────────────────────────────
+    def build_smelting_line(
+        self,
+        ore: str = "iron-ore",
+        x: int = 0,
+        y: int = 0,
+        furnace_count: int = 4,
+    ) -> tuple[bool, str]:
+        """
+        석탄 제련 라인 자동 배치.
+        stone-furnace를 y축 방향으로 furnace_count개 일렬 배치하고
+        각각에 석탄 + 광석을 자동 투입한다.
+        """
+        spacing = 3  # furnace 간격 (타일)
+        placed = 0
+        failed = 0
+
+        for i in range(furnace_count):
+            fy = y + i * spacing
+            ok, msg = self.move(x, fy)
+            if not ok:
+                print(f"    [blueprint] ({x},{fy}) 이동 실패: {msg}")
+                failed += 1
+                continue
+
+            ok, msg = self.place_entity(name="stone-furnace", x=x, y=fy)
+            if not ok:
+                print(f"    [blueprint] ({x},{fy}) 배치 실패: {msg}")
+                failed += 1
+                continue
+
+            # 실제 배치된 좌표 파싱 (REUSED 포함)
+            parsed = self._extract_coords_from_message(msg)
+            rx, ry = (parsed if parsed is not None else (x, fy))
+
+            boot_ok, boot_msg = self._auto_bootstrap_furnace(
+                furnace_name="stone-furnace",
+                x=int(rx),
+                y=int(ry),
+                reason=f"build_smelting_line: {ore}",
+            )
+            placed += 1
+            print(f"    [blueprint] ({rx},{ry}) OK — bootstrap: {boot_msg}")
+
+        if placed == 0:
+            return False, f"build_smelting_line 실패: {failed}개 모두 배치 불가"
+        return True, f"build_smelting_line: {placed}개 배치 완료 ({failed}개 실패)"
+
     # ── 제작/배치/삽입/레시피/연구/대기 ──────────────────────────────
     def craft_item(self, item: str, count: int = 1) -> tuple[bool, str]:
         result = self.rcon.lua(P + f"""
diff --git a/tests/test_build_smelting_line.py b/tests/test_build_smelting_line.py
new file mode 100644
index 0000000..fc9f31a
--- /dev/null
+++ b/tests/test_build_smelting_line.py
@@ -0,0 +1,63 @@
+import unittest
+from unittest.mock import MagicMock, patch
+from action_executor import ActionExecutor
+
+
+def make_executor():
+    rcon = MagicMock()
+    rcon.lua.return_value = "OK"
+    ex = ActionExecutor(rcon)
+    return ex, rcon
+
+
+class TestBuildSmeltingLine(unittest.TestCase):
+    def test_build_smelting_line_calls_place_entity_n_times(self):
+        ex, rcon = make_executor()
+        with patch.object(ex, "place_entity", return_value=(True, "stone-furnace 배치 (0, 0)")) as mock_place, \
+             patch.object(ex, "_auto_bootstrap_furnace", return_value=(True, "OK")), \
+             patch.object(ex, "move", return_value=(True, "도착")):
+            ok, msg = ex.build_smelting_line(ore="iron-ore", x=0, y=0, furnace_count=3)
+        self.assertTrue(ok)
+        self.assertEqual(mock_place.call_count, 3)
+
+    def test_build_smelting_line_default_furnace_count(self):
+        ex, rcon = make_executor()
+        with patch.object(ex, "place_entity", return_value=(True, "stone-furnace 배치 (0, 0)")), \
+             patch.object(ex, "_auto_bootstrap_furnace", return_value=(True, "OK")), \
+             patch.object(ex, "move", return_value=(True, "도착")):
+            ok, msg = ex.build_smelting_line(ore="iron-ore", x=0, y=0)
+        self.assertTrue(ok)
+
+    def test_build_smelting_line_partial_failure_still_reports(self):
+        ex, rcon = make_executor()
+        # 첫 번째 성공, 두 번째 실패, 세 번째 성공
+        side_effects = [(True, "stone-furnace 배치 (0, 0)"), (False, "막힘"), (True, "stone-furnace 배치 (0, 6)")]
+        with patch.object(ex, "place_entity", side_effect=side_effects), \
+             patch.object(ex, "_auto_bootstrap_furnace", return_value=(True, "OK")), \
+             patch.object(ex, "move", return_value=(True, "도착")):
+            ok, msg = ex.build_smelting_line(ore="iron-ore", x=0, y=0, furnace_count=3)
+        # 2개 성공이므로 전체 실패가 아님
+        self.assertTrue(ok)
+        self.assertIn("2개 배치", msg)
+
+    def test_build_smelting_line_all_fail_returns_false(self):
+        ex, rcon = make_executor()
+        with patch.object(ex, "place_entity", return_value=(False, "막힘")), \
+             patch.object(ex, "_auto_bootstrap_furnace", return_value=(True, "OK")), \
+             patch.object(ex, "move", return_value=(True, "도착")):
+            ok, msg = ex.build_smelting_line(ore="iron-ore", x=0, y=0, furnace_count=2)
+        self.assertFalse(ok)
+
+    def test_build_smelting_line_via_execute_dispatch(self):
+        ex, rcon = make_executor()
+        with patch.object(ex, "build_smelting_line", return_value=(True, "2개 배치 완료")) as mock_bsl:
+            ok, msg = ex.execute({
+                "action": "build_smelting_line",
+                "params": {"ore": "iron-ore", "x": -90, "y": -70, "furnace_count": 4},
+            })
+        mock_bsl.assert_called_once_with(ore="iron-ore", x=-90, y=-70, furnace_count=4)
+        self.assertTrue(ok)
+
+
+if __name__ == "__main__":
+    unittest.main()