Lifting appliance for dismantling cast-in-place box girder

The utility model relates to the technical field of bridge construction, in particular to a lifting appliance for dismantling a cast-in-place box girder. The lifting appliance for dismantling the cast-in-place box girder comprises a connecting vertical rod, a reset ring and a fixing ring, the connecting vertical rod comprises a connecting rod section, a sliding rod section and a limiting rod section which are arranged in sequence, a connecting piece used for being connected with a steel wire rope is arranged on the connecting rod section, a mounting groove is formed in the sliding rod section, and the limiting rod section is connected with the reset ring. A supporting rod used for stretching into an inner cavity of the cast-in-place box girder to support the cast-in-place box girder is rotationally connected into the mounting groove, a supporting spring used for supporting the supporting plate is connected into the mounting groove, a limiting boss is arranged at the bottom of the limiting rod section, and the