The invention discloses a 380 V voltage class APF testing platform and testing method. The 380 V voltage class APF testing platform comprises a testing circuit, an adjustable load, a testing instrument, a testing bus, a signal collection bus and a host computer system. According to the 380 V voltage class APF testing platform and testing method, the host computer system is used for controlling the on-off states of a high-voltage circuit breaker and a low-voltage circuit breaker in the testing circuit, meanwhile, a voltage disturbance generator is controlled to output different disturbance voltages, furthermore, idle work of the adjustable load and work of a harmonic generator device are controlled to be in a reactive-power output or harmonic wave output state, and the performance of APF products which are tested is analyzed through the mode that the testing instrument observes the output of the APF products which are tested; the 380 V voltage class APF testing platform is based on a power electronic device of a modularization cascade connection type structure, the structure is simple, and the control is flexible; in addition, the 380 V voltage class APF testing method takes all operational conditions of the APF into overall consideration, the adaptive capacity and the compensation effect of the APF which is tested are tested comprehensively, and therefore testing results are comprehensive and dependable.