The invention discloses a dual-clamp card puncher with single cylinder and single claw. The card puncher comprises an air cylinder. The air cylinder pushes a gantry moving frame to move downwards and simultaneously drives a buckle moving device, a card-pushing thin sheet and a cutter to move downwards, a fixing clamp and a folding clamp are folded until a buckle is punched, when returning back, the gantry moving frame drives the cutter and the card-pushing thin sheet to move upwards, the folding clamp is unfolded, and a card punching procedure is finished. The card punch speed of the card puncher is 166 times per minute; and the card puncher is highly effective and energy-saving.