Rivet nut tapping machine

The invention discloses a rivet nut tapping machine which comprises a workbench, a rotating disc is rotationally installed on the workbench, a tapping mechanism is installed on the right side of the rotating disc, a plurality of through holes are annularly formed in the outer side of the rotating disc, a tapping station is arranged at the position, matched with the tapping mechanism, of the workbench, a vertical through groove is formed in the tapping station, and a positioning column is arranged in the through groove. The positioning column penetrates through the workbench, the bottom of the positioning column is connected with a lifting air cylinder, one side of the through groove is connected with a waste discharging groove, the waste discharging groove is connected with a waste box, and clamping mechanisms are arranged on the two sides of the tapping station. The thin-wall part of the rivet nut is positioned from the bottom through the liftable positioning column, then the nut is clamped, limiting is more