Supporting plate for carton

The utility model discloses a supporting plate for a carton, which relates to the field of carton supporting plates and comprises a device body, rollers are arranged at the bottom of a fixing bolt, an elastic bolt is arranged on the front side of a third groove, a sliding groove is inserted into the back side of the elastic bolt, a limiting block is arranged at the top of a threaded groove, and a fourth groove is formed in the center of the bottom of a connecting block. And an inner cavity of the fourth groove is rotationally connected with a rotating shaft. According to the supporting plate for the carton, the turning buckles are rotationally arranged, so that the turning buckles rotate in the inner cavities of the threaded grooves, the turning buckles do not make contact with the wall body of the device body, and at the moment, the turning buckles can slide to move in the inner cavities of the sliding grooves; and a connecting block is driven to move up and down in an inner cavity of a third groove, so that