Lifting appliance for variable cross-section reinforced concrete superposed beam

The invention provides a lifting appliance for a variable cross-section reinforced concrete superposed beam. The lifting appliance for the variable cross-section reinforced concrete superposed beam comprises a box beam, a fixing mechanism; the supporting mechanism comprises a steel cable, a fixed pulley, a roller and a fixing seat, the fixing seat is fixed in the fixing mechanism, one end of the fixing seat is rotationally connected with the roller, and the steel cable is wound on the side wall of the roller; the driving mechanism comprises first variable frequency motors, a first gear and a second gear, the first variable frequency motors are symmetrically installed in the fixing mechanism, the first variable frequency motors are connected with the first gear, the first gear is meshed with the second gear, and the second gear is fixed to the side wall of the roller; a limiting mechanism; a compression mechanism; and the reinforcing mechanism is connected with the fixing seat, and the reinforcing mechanism is