Excess weld metal polishing device used after pipeline welding

The utility model relates to an excess weld metal polishing device used after pipeline welding. The polishing device comprises a horizontally-arranged transverse frame, two supporting frames, sliding rails, rolling wheels, a lead screw and a polishing wheel, wherein the two supporting frames are located at two ends of the transverse frame respectively and used for horizontally erecting the transverse frame on a pipeline; the sliding rails are located on two sides of excess weld metal after pipeline welding respectively and detachably arranged on the pipeline; the rolling wheels are arranged at bottoms of each supporting frame, can roll in the arrangement direction of each sliding rail and are arranged on each sliding rail; the lead screw is arranged on the transverse frame and matched with the transverse frame; the polishing wheel is arranged at the bottom of the lead screw; and the lead screw is perpendicular to the transverse frame. By the aid of the polishing device, the excess weld metal is good in polishing quality (high in precision) and high in appearance attractiveness, and the polishing device is simple in structure and convenient to operate.