Planetary gear motor driving system

The invention discloses a planetary gear motor driving system which comprises a planetary reducer which comprises a first-stage planetary gear train, a second-stage planetary gear train, a third-stage planetary gear train and a fourth-stage planetary gear train. The lubricating device is fixedly mounted on the planetary reducer; the first-stage planetary reduction gear train is provided with a first-stage shell, a first-stage inner gear ring is fixedly installed in the first-stage shell, a first-stage planet carrier is rotatably installed in the first-stage shell, a plurality of first-stage planet gears are installed on the first-stage planet carrier, and the first-stage planet gears are meshed with the first-stage inner gear ring. A first-stage end cover is fixedly installed at an opening of the first-stage shell, a first-stage sun gear is rotatably installed on the first-stage end cover, the first-stage sun gear is meshed with a first-stage planet gear in the first-stage inner gear ring, the extending end o