The invention relates to a tool used for riveting an overall press machine, which is used for riveting ventilation slot plate punching pieces and air channel plates. The tool comprises an upper pressure plate, a positioning plate, a fastening bolt and a bottom plate, wherein the positioning plate is positioned by the front edge on the bottom plate and is fixed to the bottom plate through the fastening bolt; an air channel plate to be riveted is placed in an air channel positioning groove of the positioning plate; riveting feet of the air channel plate are upward; a ventilation slot plate punching piece to the riveted is placed in an annular groove of the positioning plate; all of the riveting feet of the air channel plate fall into the riveting foot holes of the ventilation slot plate punching piece; and the upper pressure plate covers the top of the ventilation slot plate punching piece and covers the riveting feet of all air channel plates. By using the tool, the height size of the riveted ventilation slot plate is accurate, the arrangement situation of the air channel plates is good, the angle is correct, the air channel plates are not damaged, the riveting points are beautifuland firm, and the riveting quality and the riveting efficiency are improved greatly.