Abstract: Traditional single-stage boost inverter can overcome the disadvantages of incompatibility between boost and inverter.However, the boosting capability of this type of circuit is limited by the modulation factor M owing to the structure of the topology so that it cannot fully exploit its advantages. Aiming at the existing technical defects, this paper proposed a high-boost single-stage inverter,which uses the improved voltage multiplier unit of DC-side and shoot-through state of inverter-side to realize dual degree of freedom adjustment of the AC output voltage, and a large boost factor can be obtained when the duty ratio is low. The buffering effect of the capacitor can effectively reduce the switch-voltage spikes of the DC-link voltage, and the inverter’s effect becomes more prominent.Therefore, proposed inverter is suitable for the inverter with high boosting requirements for photovoltaic grid connection. This paper described the working state of the inverter, and carried out theoretical analysis and simulation verification, and did the circuit parameter comparisons with the classical converter. Then a 600 W prototype was built to verify the feasibility of the circuit. The final experimental results verify the feasibility and correctness of the proposed inverter.