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The problem of mine electrical equipment, especially mine frequency converters, which pollutes the power quality of underground power grids is getting more and more attention from research and development manufacturers, safety access, and various industrial and mining enterprises. The harmonic generation mechanism of mine inverter is briefly described,a set of load performance test system based on FLUKE1760 is designed. The system is mainly composed of test prototype, accompany test inverter, tow motor, power quality analyzer, host computer and other units. Using this system, the frequency converter was tested for harmonic loading performance, the voltage and current data were analyzed for harmonics. The actual measurement result proves that, the voltage and current of the tested inverter all contain larger 5th harmonic and higher harmonic.