The utility model discloses a processing of copper line is with drawing die lacquer case subassembly, including storing up the paint can, its characterized in that: the oral area that stores up the paint can is equipped with and adds the lacquer pipeline, be equipped with the pressure release mouth on the lateral wall with the lacquer pipeline, the bottom plate intercommunication that stores up the paint can send the lacquer pipeline, send the lacquer to be equipped with the pump on the pipeline, the pump will coat with lacquer to be carried in the lacquer case. The utility model discloses reduce the enamelling machine and shut down with the lacquer number of times, improve enamelling machine job stabilization nature.