A permanent-magnet synchronous wind-driven generator unit power factor control method comprises three parts: double PWM converters, current double-closed-loop control and space vector modulation. The invention uses the double PWM converters as the grid-connected circuit of a direct-drive permanent-magnet synchronous wind-driven generator, and controls the motor-side converter to realize the unit power factor control and the maximum wind energy acquisition control of the generator. The method achieves permanent-magnet synchronous wind-driven generator unit power factor operation, has practical significance for reducing the running capacity of the motor-side converter, has good dynamic and static control performance, can realize maximum wind energy tracking, grid-connected active and reactive independent control, and variable-speed constant-frequency power generation operation.