Adjustable inverted punching die punching aperture

The utility model discloses an adjustable inverted punching die punching an aperture. The adjustable inverted punching die comprises a positioning nail, a discharging plate, a small guide pillar, a slide block, a pedestal, a female die, a punching head, a rubber washer and an upper die seat, wherein the slide block installed in a lower die seat is connected with the pedestal via a bolt; the lower die seat can slide along a guide part of the slide block; a fixing plate and the slide block are fastened together; the punching head and the small guide pillar are mounted on the fixing block; the discharging plate and the lower die seat are fixed together; the positioning nail is mounted on the discharging plate; the female die and an upper die are fastened via a screw and a pin; a groove corresponding to the positioning nail is formed on the lower end part of the female die; a through hole, in which the punching head and the small guide pillar can relatively slide is formed in the discharging plate; and the rubber washer is mounted between the pedestal and the upper die seat. The beneficial effects of the adjustable inverted punching die punching the aperture are that a die positioning base level is overlapped with a punching surface, so in-coincidence error of benchmarks can be avoided and die maintenance and replacing effect can be improved; with length reduction of the punching head, strength of the punching head is enhanced and service life of the die is prolonged; and die maintenance and adjustments are simplified.