The present invention relates to a drive system for a wind turbine, comprises a driver unit comprising at least one planet gear stage, wherein the planet gear stage is provided with a gear ring, a plurality of planet gears, a planet carrier and a sun gear. The drive system is further provided with a first shaft attached to the driver unit, and the first shaft is provided with a connection flange connected with a work machinery shaft or a rotor shaft, and is mounted through the planet carrier. A driver housing encloses the driver unit and an engine unit or a power generator unit connected with the second shaft of the driver unit, and the engine unit or the power generator unit comprises a rotor connected with a rotor hollow shaft in a manner of anti-torsion. Between the second shaft of the driver unit and the rotor hollow shaft there is radially provided a connector or a clamping connection member, and a driver housing supporting member arranged between the driver unit and the engine unit or the power generator unit is provided with a hollow cylindrical extending portion, wherein the extending portion concentrically encloses the end portion segments of one side of the engine unit or the power generator unit of the second shaft of the driver unit to form a bearing seat used for a bearing structure radially arranged between the second shaft and the hollow cylindrical extending portion, and the rotor and the rotor hollow shaft concentrically encloses the extending portion.