Polishing device for machining plate roller

The utility model belongs to the field of printing roller machining, and particularly relates to a grinding device for machining a printing roller, which comprises a machining table, a turntable is rotatably mounted in the middle of the top of the machining table, and a plurality of positioning mechanisms are uniformly and rotatably mounted at the top of the turntable. A baffle is fixed to the position, corresponding to the positioning mechanism, of the top of the rotating disc, a grinding mechanism is installed on one side of the machining table, the positioning mechanism comprises a rotating block, a positioning cylinder, a first threaded rod, a connecting rod and a positioning rod, the rotating block is rotationally installed at the top of the rotating disc, and the positioning cylinder is fixedly installed at the top of the rotating block; by means of the structural design of the machining table, the rotating disc and the positioning mechanism, when the device is used, a plurality of printing rollers to b