Air blocking cylinder tool

The air cylinder blocking tool comprises a plurality of positioning columns, the positioning columns are connected to a machining table in a sliding mode, the positioning columns are perpendicular to the machining table, and the multiple positioning columns are arranged in a circumferential array mode with the center point of a mounting groove body as the circle center; the operating rod is rotationally connected to the machining table, an operating wheel is rotationally connected to the position, corresponding to the circle center of the positioning column array, of the machining table, the operating rod can drive the operating wheel to rotate, and the operating wheel is fixedly connected with a threaded rod; the movable plug is in threaded connection with the threaded rod, the side wall of the movable plug can abut against the side walls of the positioning columns, and when the movable plug moves in the height direction of the positioning columns, the movable plug can drive all the positioning columns to mo