The invention discloses a lifting tool of a lifting appliance. The tool comprises two symmetric cross beams, two cross beam supports are fixedly provided with lifting ring connection blocks, lifting rings are fixedly arranged on the tops of the lifting ring connection blocks, two symmetric longitudinal beams are arranged on the two cross beams in a sliding manner, two symmetric first holes are formed in the longitudinal beams, the cross beams are in sliding connection to the first holes, two symmetric lifting claw clamps are arranged on the longitudinal beams, two symmetric cavities are formedin the cross beams, same lead screws are rotatably arranged on the inner walls of two sides of the cavities, sliding bases are arranged in the cavities in a sliding manner, the sliding bases are arranged on the corresponding lead screws in a thread sleeving manner, second holes are formed in the inner walls of the bottoms of the cavities, and fixed bases are fixedly arranged on the bottoms of thesliding bases. The lifting tool is high in practical performance, simple in structure, convenient to operate, and capable of conveniently adjusting the longitudinal beams and fixing the longitudinalbeams, when equipment is lifted, shaking is not prone to happening, and a user can conveniently use the tool.