Punching device for vehicle body side outer plate and punching method of punching device

The punching device comprises a supporting seat, the top end of the supporting seat is installed in the middle of the bottom end of a punching bearing plate, the top end of the punching bearing plate is connected with a pushing plate through a rolling mechanism, and the front side and the rear side of the top end of the pushing plate are connected to the bottom end of a connecting plate through sliding mechanisms. The rear side of the top end of the punching bearing plate is installed at the bottom end of the rear side of a connecting plate through a lifting plate, and a connecting rod penetrates through the middle of the connecting plate. According to the side wall outer plate punching device, under the common use effect that a rolling mechanism is matched with a sliding mechanism, a pushing plate can relatively stably push a side wall outer plate to move at the top end of a punching bearing plate, punching work is conducted in cooperation with a punching gun, and the stabilizing efficiency of the device in