Abstract: In order to solve the problems of low power conversion rate of electric energy in traditional photovoltaic inverter system, it designes an inverter system with stable output voltage, high conversion efficiency and strong system robustness. The system is composed of a DC-DC voltage regulator module and a full-bridge inverter module. A remote control and display module are added to realize the human-computer interaction function. The system adopts double closed-loop PID control algorithm to realize the pre-voltage regulation, and converts DC into AC through SPWM modulation technology. The test results show that the inverter system has the characteristics of wide input voltage range, stable output AC voltage, adjustable AC frequency step and low signal distortion rate.