Automatic box dumping device

The utility model relates to an automatic box dumping device which comprises a framework of a container box body, wherein a horizontal conveying mechanism is arranged in the depth direction of the framework and comprises a motor, a sensor, a screw rod, a screw nut and a sliding rail; the screw rod and the screw nut are driven by the motor; the sliding rail is arranged at an inner side edge of the framework in the depth direction and consists of roller wheels; at least one sliding rail is arranged at each of two side edges of the framework symmetrically in the depth direction; lifting mechanisms are arranged at the two side edges of the framework in the depth direction; each lifting mechanism comprises a lifting guide rail, a sensor, a lifting rope and a catching hook; the lifting guide rail is fixed on the framework; the lifting rope is connected with the motor; the catching hook can move up and down along the lifting guide rail and is connected at two ends of the lifting rope respectively; a catching pin is