Precise punching machine

The utility model discloses a precise punching machine which comprises a punching machine body, a gearbox, a gearbox cover, a motor, a plunger chip and a punching machine table-board, wherein the plunger chip is connected into the punching machine body by a crank type connecting mechanism; an integrated air cylinder is adopted in the punching machine body for providing a medium air source; an oil filling port in the gearbox cover is inwards sunken to form a funnel shape with a wide top and a narrow bottom. According to the precise punching machine, the crank type linking mechanism is adopted; when different models of punching machines are used for production, the crank type connecting rod is kept unchanged, and crank type bent axles with different sizes are machined; the production efficiency is improved, and the enterprise production cost is reduced; under the condition of ensuring the enough air storage capacity of the air cylinder, two air cylinders are combined into one air cylinder, a clapboard is used f