Carton unpacking machine

The invention discloses a carton unpacking machine. Position adjusting of all parts of a storage mechanism of the carton unpacking machine is achieved through a motor driving mechanism, and synchronous adjusting is conducted on a lower packing mechanism; an unpacking mechanism is provided with a plurality of movable suction cups in the height direction, after the motor driving mechanism is adoptedto realize position adjusting, cartons with different length specifications are correspondingly adsorbed, the suction cups in the height direction can be selected to work and stop according to the specifications of the cartons, the cartons with different height specifications are correspondingly adsorbed, and the situation that the upper-layer suction cups are selected to stop work for relative small specification is facilitated; and through the motor driving mechanism, height debugging of an upper pushing frame on the rear part is achieved, the cartons with the different height specifications are adapted, the upper