Aiming at the problems of narrow working wind speed range and low utilization rate of wind energy in wind power generation systems, a disktype dualrotor counterrotating permanent magnet wind generator was designed, which operated with dualrotor contrarotating. On the basis of introducing the structure and operation principle of the motor, the power dimension equation of the motor was deduced, and the preliminary design method of the motor was given. The threedimensional modeling and dynamic simulation analysis of the motor were carried out by using finite element software. The magnetic circuit characteristics and electromagnetic performance were obtained, and the effectiveness of the proposed design method was verified.