A single-cylinder single-claw double-card punching machine, including an air cylinder; the working end face of the air cylinder is connected to a connecting frame; a gantry moving frame is disposed in the middle of the lower part of the connecting frame in an interleaved manner; a piston rob of the air cylinder passes through the connecting frame to connect with the gantry moving frame; both sides of the connecting frame are provided with snap action moving device; a retaining clamp and a folding clamp are disposed at the bottom of the connecting frame; and a card-pushing sheet and a cutter are disposed under the gantry moving frame. The card punching speed of the single-cylinder single-claw double-card pneumatic punching machine is as high as 166 times per minute, with high efficiency and energy savings.