Printing roller polishing device

The utility model relates to a printing roller polishing device which comprises a box body and a polishing support, printing roller rotating clamping mechanisms are arranged on the left side and the right side of the box body respectively, a printing roller polishing mechanism is arranged on the polishing support, and the printing roller polishing mechanism comprises a longitudinal air cylinder, a first waterproof box, a polishing head motor and a polishing head. The longitudinal air cylinder is fixedly installed on the grinding support, the first waterproof box is connected to an output shaft of the longitudinal air cylinder, the grinding head motor is arranged in the first waterproof box, the lower end of the first waterproof box is fixedly connected with a sealing output sleeve, and the output shaft of the grinding head motor downwards penetrates out of the first waterproof box and the sealing output sleeve. The grinding head is fixedly connected to an output shaft of the grinding head motor, a grinding li