An electric rivet nut machine comprises a motor having a first output shaft and a second output shaft; the first output shaft is connected with a first gear set, and the second output shaft is connected with a second gear set; and a rivet nut drive unit having a rivet nut shaft, a coupling gear and a moving gear; the coupling gear is engaged with the second gear set; the moving gear is engaged with the first gear set; through the first gear set and the second gear set of the motor respectively engaging with the rivet nut drive unit, and through the first output shaft and the second output shaft at two ends of the motor respectively engaging with the first gear set and the second gear set, different gear ratios can be formed, and better gear drive ratio can be produced for the rivet nut drive unit.