A drive device for a washing machine includes a motor, a washing shaft, a dewatering shaft sleeve sleeved on the washing shaft, the washing shaft is coaxially installed in a rotor of the motor, and further includes a planetary gear speed reduction mechanism built in the rotor and the planetary gear speed reduction mechanism includes: a sun-gear sleeve sleeved on the washing shaft and fixedly connected to the rotor; a planetary gear assembly, including a planetary gear meshing with the sun-gear sleeve, and the planetary gear assembly is fixedly connected to the washing shaft via a planetary carrier; the number of the planetary gear is plural, and the multiple planetary gears are evenly distributed about the sun-gear sleeve; and an internally toothed ring gear meshing with the planetary gears and fixedly connected to the dewatering shaft sleeve.