In order to improve the control performance of the doubly fed wind generator, the fractional order sliding mode control was used in the direct power control system of the doubly fed wind generator. The fractional order calculus was introduced into the sliding mode control to constitute a fractional order sliding mode controller, which weakened the chattering of the traditional sliding mode control by using the fractional order genetic attenuation characteristics. The fractional order sliding mode control law was derived for doubly fed induction generator, and the stability of the system was proved by Lyapunov stability theorem. The proposed fractional order sliding mode control system saved the current loop control, simplified the control structure, and realized the effective control of active power and reactive power. The simulation and experimental results showed the effectiveness of the proposed fractional order sliding mode control system and the weakening of the chattering in the traditional sliding mode control.