A panel unpacking method includes (1) providing a panel unpacking device, which includes a pickup device including a manipulator and suction cups mounted to the manipulator and a conveyance device including a main body, a mounting board mounted to the main body, pins mounted to the mounting board, and cushioning device installed on the pins; (2) moving the manipulator to approach the panel until the suction cups of the manipulator get into contact with the panel; (3) the suction cups sucking and holding the panel and the manipulator making a movement to lift up the panel; (4) the manipulator carrying the panel to approach the pins of the conveyance device until the panel gets into contact with the contact sections of the pins; and (5) the suction cups releasing the panel to allow the panel to be stably positioned on the pins of the conveyance device.