Polishing device for steel structure machining

The utility model discloses a polishing device for steel structure machining, particularly relates to a polishing device, and aims to solve the problems that when some polishing devices are used, steel needs to be fixed manually, then polishing is carried out according to the needed structure, and the body health of workers is easily injured in the polishing process. A positioning plate is fixedly installed at the center of the outer wall of the double-thread screw, one side of the positioning plate is fixedly connected to the inner surface of the clamping frame, a first clamp and a second clamp are fixedly connected to the lower surfaces of the two sliding blocks, the sliding blocks are arranged at the bottoms of the first clamp and the second clamp, and one end of each sliding block is movably connected to the interior of a sliding groove in the bottom of the clamping frame; and one end of the double-thread screw extends to the outer surface of the clamping frame and is connected with a handle, the double-t