Board polishing machine for PCB

The utility model relates to the field of circuit board processing, in particular to a board polishing machine for PCBs, which comprises a frame, a feeding mechanism arranged at the front end of the frame, a discharging mechanism arranged at the rear end of the frame, a feeding port arranged on one side of the frame close to the feeding mechanism, a discharging port arranged on one side of the frame close to the discharging mechanism, and a group of conveying rollers respectively arranged at the feeding port and the discharging port. A group of polishing rollers are arranged between the two groups of conveying rollers in the rack, each polishing roller is composed of an upper roller and a lower roller, abrasive paper used for polishing is arranged on the surfaces of the upper rollers and the lower rollers, a purging pipe is arranged at the position, located at the front ends of the conveying rollers, of the discharging port, the purging pipe is parallel to the conveying rollers, and arow of multiple air outle