The invention relates to the technical field of rectifiers, and particularly relates to a double-frequency single-phase PWM rectifier comprising a shell which is internally provided with a circuit board. The circuit board comprises a control unit and a main loop unit. The main loop unit is composed of a low frequency power unit and a high frequency harmonic elimination unit. The required inductance of the power filter can be reduced through the novel topological structure so that the inductor size can be reduced, the cost of the PWM rectifier can be reduced, the control difficulty of the PWM rectifier can be simplified, the switching frequency of the high power switching device can be reduced and the efficiency and the power density of the rectifier can be enhanced.