Abstract: Due to the negative effects of energy waste and harmonic pollution caused by traditional battery charging and discharging devices, the application effect is not satisfactory. Therefore, a design method for battery charging and discharging device based on reversible PWM rectifier is proposed. In order to ensure that all indicators of the battery meet the requirements for charging and discharging, the main circuit parameters of the battery are determined based on the main circuit diagram of the battery; control the inner and outer loop currents of the battery charging and discharging device based on the inner loop current transfer function and the outer loop current closed-loop function, combined with a PI controller; then use a reversible PWM rectifier to calculate the output voltage value and compare it with the target value for battery voltage regulation; finally, seamless switching of battery charging and discharging states is ensured by implementing alternating automatic switching between the DC system and the discharge device. The experimental results show that the measured battery cell voltage and charge discharge current of this method are within the range of actual values, and the battery temperature is always maintained between 20～25 ℃, indicating that the application effect of this method is the best.