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The punching device of the fully automatic ultra-high-speed bag making machine relates to the technical field of bag making machines. It includes a booster cylinder and a punch plate support seat; two booster cylinder fixing plates are installed on the upper fixed beam of the bag making machine, and two booster cylinders are installed on the booster cylinder fixing plate; a punch connecting seat is installed at the lower end of the booster cylinder piston rod, a punch connecting plate is installed below the punch connecting seat, a punch blade plate connecting seat is installed below the punch connecting plate, and a punch blade plate is installed at the lower end of the punch blade plate connecting seat; the punch plate support seat is located directly below the punch blade plate; an adjustment support seat is provided above the lower fixed beam of the plastic bag making machine , the upper end of the adjustment screw passes through the adjustment support seat, and the lower end is connected to the lower fixed beam; the bearing and the plane bearing are installed on the adjustment support seat, and the punch plate support seat is installed on the plane bearing. This device solves the problems that similar equipment cannot adjust the height, the adjustment operation is inconvenient, the punched bags are not flat, the punching depth is different, the support plate cannot rotate, and the punching plate has a short service life.