Polishing device for cover plate machining

The utility model relates to the technical field of grinding, in particular to a grinding device for cover plate machining, which comprises a base, a T-shaped groove is arranged at the upper end of the base, a motor is fixedly mounted on the side wall of the base, a first screw is mounted in the base in a clamping manner, and two threads opposite in thread direction are arranged on the first screw. A T-shaped groove is formed in the base, two T-shaped sliding blocks are movably installed in the T-shaped groove in a clamped mode, the two T-shaped sliding blocks are both installed on the first threaded rod in a threaded mode, a clamping mechanism is arranged on the base, the automobile driver cover plate needing to be polished is placed on the base, then a motor is started, an output shaft of the motor rotates, and therefore the first threaded rod is driven to rotate; the first screw rod can drive the T-shaped sliding blocks in threaded engagement with the first screw rod to move close to each other and drive t