The cleanliness of the cylinder head which is an important part of the engine directly affects the engine’〖KG-*2〗s power, emissions, vibration performance and so on. In the engine cylinder head, the cooling water holes around the combustion chamber are tiny and deep, so the original engine cylinder head cleaning tool can not achieve fixedpoint cleaning, and the cleanliness of the workpiece can not be fully guaranteed. Therefore, a new improved CNC fixedpoint cleaning tool was designed, which mainly included the tool holder and nozzle body. On the primary side of the tool nozzle, there were six blowholes distributed at a certain angle, and they could clean the cooling water holes at fixed point. The new improved cleaning tool can enhance the cleaning effect. Meanwhile, the moving path of the cleaning tool is also improved,by which the moving time of the cleaning tool is significantly reduced， and production tempo is accelerated and the energy consumption is saved.