Abstract: For problems of large ripple of power supply, difficult selection of high-power load, low test efficiency and high test energy consumption existed in existing DC chopper test platform, a mine-used DC chopper test platform based on energy self-circulation mode was proposed. The platform uses three-phase transformer, three-phase uncontrolled rectifier circuit, Buck circuit and constant voltage and current limiting control strategy to achieve adjustable voltage source output voltage of 0-750 V, and adopts Boost circuit and constant current strategy to realize energy self-circulation load output current of 0-240 A, so as to realize large-scale adjustment of voltage and current and improve test efficiency. Meanwhile, output energy from the energy self-circulation load is fed back to output end of the adjustable voltage source to realize energy self-circulation and reduce test energy consumption. The simulation and experimental results verify effectiveness of the platform.