Abstract: A kinetic energy conversion device of a punching machine includes a punching table, a power unit, an air compressor, a clutch, a gas storage tank, a pressure detector and a generator. The power unit, the air compressor, the clutch, the gas storage tank, the pressure detector, and the generator are all disposed on the punching table. The power unit drives the clutch, air compressor, and generator to generate electrical power and high pressure gas. Therefore, the air compressor can operate without using additional energy. Compared with conventional punching equipment and the air compressor externally disposed and connected to the punching equipment, a large amount of electricity cost can be saved, achieving a power saving effect.