A brushless double feed motor control device and a direct torque control method thereof. The device comprises a brushless double feed motor, a flux linkage, a torque observer, etc., wherein the torque observation is calculated under the stationary reference frames of a power winding and a control winding. The method comprises the following steps: the voltage and the current of the control winding, as well as the power winding are observed under a three-phase coordinate system and coordinate transformation is performed, so as to get the voltage and the current of the control winding, as well as the power winding under respective stationary reference frame; the flux linkages and the torques of the control winding and the power winding are calculated; and the voltage vector is selected through the sector the flux linkage is positioned which is determined by the flux linkage of the control winding, and the torque and flux linkage increments obtained by the demand and feedback of the torque, and those of the flux linkage of the control winding. By adopting the invention, the torque observation of the brushless double feed motor can be realized under the stationary reference frames of the power winding and the control winding, so as to avoid unstable observation results caused by rotational coordinate transformation and measuring error due to rotor angular velocity. The control system has simple structure and higher control accuracy.