The utility model discloses an air condition compressor main casing side face punching device belongs to the air condition compressor production facility, including mount pad, positioning seat and drill bit, the positioning seat is equipped with threely, and every positioning seat rear portion sets up the power cylinder, and the positioning seat equipartition sets up the drill bit between two positioning seats on the mount pad, drill bit connection of after section oil hydraulic cylinder. The utility model discloses an air condition compressor main casing side face punching device can carry out accurate location and punch the main casing body, and this side punching device not only can advance the circularity that line location can also detect the main casing body, guarantee production quality to the main casing body simultaneously.