The utility model provides the automatic pile of paper packing box, tear a yard device open, set up on the online body, the line body is conveyor commonly used, this device is including the frame and set up the jacking device in the frame, press from both sides and get device and elevating gear, the jacking device sets up in the frame lower part, it is the free end that elevating gear sets up in frame upper portion and elevating gear lower extreme, press from both sides and to get that the device is fixed to set up the lower extreme in elevating gear, the line body sets up in the jacking device and presss from both sides and gets between the device, the clamp is got the device and is included the fixed plate, deflector and gripper mechanism, the vertical deflector one end that is fixed in of fixed plate, under the deflector terminal surface be provided with with fixed plate vertically slide rail, gripper mechanism passes through the slide rail slip and sets up in the deflector lower extreme, the deflector lower extreme is provided with clamping jaw air cylinder, clamping jaw air cylinder's piston rod and gripper mechanism are connected.