The battery test simulator has two functions: battery charging and discharging test, battery working condition simulation test (dynamic current waveform simulation test). The battery test simulator adopts an energy feedback topology, which can feed back the energy of the battery to the power grid. It avoids waste energy consumption and saves electricity charges during battery discharge simulation. The simulator has four charging and discharging modes of constant voltage/constant current/constant power, which can automatically limit the voltage operation after the battery is charged and discharged. Through the programmable function of the simulator, it can realize charging and discharging in any current waveform and simulate fast and irregular working conditions. The hardware meets the seamless switching of charging and discharging, and there is no instantaneous interruption or delay in the switching of charging and discharging modes.