The utility model discloses a steel protection sleeve, which belongs to the technical field of safety or protection measures which prevent a building component or decoration piece from being damaged in a construction process. The steel protection sleeve comprises a sleeve body. A transverse long notch is arranged on the sleeve body. A rib which matches the surface of thread steel is arranged on the inner wall of the sleeve body. Thickened edges are arranged on the peripheries of both end openings of the sleeve body and both sides of the long notch. The sleeve body is a cross-linked polyethylene injection molding piece. According to the utility model, a plastic or rubber material can be selected; the steel protection sleeve has the advantages of convenient installation and disassembly, labor saving, repeated use, white pollution prevention and the like, and is not affected by the surrounding environment; the quality of concrete pouring is ensured; a construction progress is quickened; and the construction cost is reduced.