Lightweight pressing rivet nut for automobile

The utility model discloses a light-weight pressing rivet nut for an automobile, relates to the technical field of pressing rivet nuts, and aims to solve the problems that after an existing pressing rivet nut and a thin plate are pressed, the limiting effect is poor, and the overall compactness is high. A nut rod is arranged at one end of the supporting disc, a plurality of supporting face convex straight teeth which are annularly distributed at equal intervals are arranged on the face, close to the nut rod, of the supporting disc, semi-elliptic cylinder grooves are formed in the supporting face convex straight teeth, and semi-elliptic cylinder inlets are formed in the ends, close to an outer ring of the supporting disc, of the semi-elliptic cylinder grooves. A limiting groove is formed in the upper end of the semi-elliptic cylinder groove, a plurality of nut rod concave straight teeth are arranged at the end, close to the supporting disc, of the nut rod, a bolt inner blind hole is formed in the nut rod, and