Abstract: In order to solve the problems of incomplete test items, low test efficiency, poor safety and low torque load accuracy of the existing mine inverter test system, a mine inverter performance test system consisting of power supply system, load test bench and measurement and control system is designed by using AC feedback load technology. The power supply system provides control and power supply for the measurement and control system and the load test bench. The load test bench adopts the frequency conversion load mode of common bus to provide load environment for the tested inverter. The measurement and control system monitors the operation status of the system in real time, and controls the power supply system and the load test bench through the measurement and control host. Based on WinCC configuration software, the test system software including monitoring and control module, test management module and safety management module is developed. The monitoring and control module is used to realize project information management, data acquisition, processing, storage, and control the equipment through the measurement and control host. The test management module is mainly used to manage test items, test procedures, test methods, etc. It can test the performance of the inverter such as leakage blocking, instantaneous power failure protection, output short circuit protection, overload protection, open phase protection, over voltage and under voltage protection, light load, traction characteristics, temperature rise, etc. The safety management module ensures the safety and control of the test process in terms of operation safety protection, equipment safety protection and system operation safety. The constant torque load control algorithm is proposed to improve the torque load accuracy. The test results show that the system has high test accuracy, and the torque load error is less than 1% within the rated torque range. The AC feedback load method is adopted, and the system power consumption rate does not exceed 30%. The electromagnetic compatibility of the system meets the standard requirements.