Steel structure surface defect detection device

The utility model discloses a steel structure surface defect detection device. Magnetic powder recovery box, support legs are mounted at four end corners of the bottom surface of the recovery magneticpowder box; the number of the supporting legs is four. A lower cover is mounted in the middle of the bottom surface of the recovery magnetic powder box; a handle is mounted on the lower end surface of the lower cover; an electromagnet is mounted in the middle of the bottom surface of the inner wall of the magnetic powder recovery box; a water outlet pipe is mounted on one side of the magnetic powder recovery box; a base is mounted on the inner side of the magnetic powder recovery box; supporting rods are installed at the four end corners of the bottom face of the base correspondingly, supporting frames are installed on the two sides of the upper end face of the base correspondingly, the number of the supporting frames is two, a transverse plate is installed above the supporting frames, and a magnetic powder liqui