The invention discloses a crampon for a building crane, and relates to the technical field of crane accessories. The crampon comprises a fixing rod. The fixing rod is inserted in the upper portion ofa crampon body in a penetrating mode and located below a connecting mechanism. The upper end of the crampon body is mounted at the lower end of the connecting mechanism. The connecting mechanism comprises a mounting block, connecting blocks, a bearing and a rotating seat. A limiting mechanism is mounted at an opening of the crampon body and comprises a connecting piece, a spring, a baffle, a stopping block and a pin shaft. Reinforcement bars are mounted on the lower portion of the crampon body. According to the crampon, by arranging the connecting piece, the spring, the baffle, the stopping block, the pin shaft, the mounting block, the connecting blocks, the bearing, the rotating seat and the reinforcement bars, the problems that when the crampon is used, a baffle part is prone to rusting,and the crampon is poor in safety and unstable in lifting work when used are solved.