The utility model discloses an efficiency of mould steel panel mills light is improved device, it includes frame and the workstation of locating frame one side, be equipped with the mould steel constant head tank on the workstation, install motor, driving belt, drive wheel in the frame and mill the mechanism, the motor is connected to on the drive wheel through driving belt, the drive wheel with mill the mechanism and be connected, and the drive wheel, mill the mechanism and install the both sides in the frame respectively, mill the mechanism and locate the workstation near mould steel constant head tank part, it includes milling cutter and fixing base to mill the mechanism, install the pivot on the drive wheel, the milling cutter cover is established in the pivot, the fixing base is fixed in frame one side, and the fixing base is equipped with the perforation in the middle of positive, and this perforation is passed in the pivot. The utility model discloses a drive drive wheel, rethread transfer gear drive pivot rotation with the motor to drive the milling cutter motion, avoided that the gear is thin, the power of motor leads to milling cutter to have in the course of working that the motor area is motionless, defect not in place can not milled or milled in the mould steel side for a short time.