To reduce the influence of the current distortion of the switching converter on the power supply quality of the power grid and improve the dynamic response performance of the load voltage, an improved control scheme for a practical single-phase power factor correction device is designed in this paper. Based on the establishment of a small signal model, the corresponding compensator is designed according to its frequency domain characteristics, and the controller of the voltage loop is improved to a fuzzy PI controller. The simulation results show that the output voltage of the designed Boost PFC converter has been improved well, and the power supply quality of the power grid is effectively improved.