A lifting appliance for installing a rolling mill housing comprises an upper lifting lug and a lower lifting lug. The upper lifting lug comprises two connecting plates, wherein the surfaces of the connecting plates are parallel. A top plate and a bearing plate are arranged between the connecting plates from top to bottom at intervals. Through holes are formed in the middle of the top plate and the middle of the bearing plate. Lugs are arranged at the bottoms of the connecting plates. The lower lifting lug is a plate body which is reversely T-shaped. The upper portion of the reversely T-shaped plate body is hinged to the lugs. A cross rod at the bottom is connected to an oil cylinder hole in the head of a rolling mill housing in a clamping mode. The lifting appliance is simple in structure and easy and convenient to assemble and disassemble.