An amplitude limiting method of an APF comprises the following steps: (1) limiting the amplitude of a modulation wave; (2) detecting a peak value of a three-phase sinusoidal signal of the modulation wave; (3) designing a PI controller, and calculating an amplitude limiting coefficient by utilizing the PI controller; and (4) taking the product of the modulation wave and the amplitude limiting coefficient as an amplitude-limited modulation wave to drive a power electronic device, so as to enable an APF to output a current compensation waveform. According to the APF amplitude limiting method provided by the invention, proportional scaling is directly carried out on modulation, topping is not generated, and pure sine waves can be output. The reaction time is shortened, and the dynamic effect is improved.