Steel structure surface polishing device

The utility model discloses a steel structure surface polishing device which comprises a supporting table, an L-shaped support is arranged above the supporting table in a sliding mode, a polishing piece sliding horizontally is arranged on the L-shaped support, and the sliding direction of the polishing piece is perpendicular to the sliding direction of the L-shaped support. According to the surface polishing device, the clamping block is controlled to move to be clamped in the clamping groove, the polishing block is rotated to be vertical, the polishing block is adjusted to be above a to-be-polished recess or a to-be-polished drill hole, the polishing block is inserted into the to-be-polished recess or the to-be-polished drill hole, and the to-be-polished recess or the to-be-polished drill hole is polished. The axis of the second motor is adjusted to be close to the center position of the to-be-polished recess or drill hole, at the moment, the polishing block is attached to the side wall of the to-be-polished