Drive system of one-step two-for-one twister

The utility model relates to a drive system of a one-step two-for-one twister. The drive system comprises a rack, a speed changing motor, a gear box, a drive gear, a plurality of chain wheels, a winding shaft, a driving belt, an overfeed roller shaft and a lower roller shaft, wherein the speed changing motor is arranged at one side of the rack, one end of the gear box is connected with the speed changing motor, the drive gear is arranged at the other end of the gear box, the plurality of chain wheels are respectively and fixedly supported at one end of the winding shaft, one end of the overfeed roller shaft and one end of the lower roller shaft, the driving belt is sleeved on the chain wheels and is used for driving the chain wheels to rotate, and a second gear engaged with the drive gear is further arranged at one end of the winding shaft. The drive system of the one-step two-for-one twister has the advantages of simple structure, accurate driving, low manufacturing cost and the like.