Auxiliary positioning mechanism for automatic punching of plastic part

The utility model provides an auxiliary positioning mechanism for automatic punching of plastic parts, which relates to the technical field of auxiliary positioning mechanisms and comprises a positioning plate, a movable plate and a punching sleeve, sliding grooves are symmetrically arranged on two sides of the positioning plate, and an adjusting mechanism for position adjustment is arranged between the positioning plate and the movable plate. Connecting mechanisms connected with the plastic parts are symmetrically arranged on the two sides of the positioning plate; the eccentric wheel is driven by the rotating handle to rotate downwards, so that the outer wall of the bottom of the eccentric wheel extrudes the sliding rod to move downwards, the sliding rod drives the suction cup to be attached to the plastic part, air below the suction cup is exhausted to form a negative pressure area, and the eccentric wheel is extruded by external positive pressure; the eccentric wheel is fixedly connected with the plastic