Abstract: In the photovoltaic power generation system, because the AC output voltage of the traditional single-stage inverter is lower than the DC side power supply voltage, multiple groups of photovoltaic panels are usually connected in series on the input side to increase the DC input voltage to meet the demand of the AC side output standard voltage. However, after multiple groups of photovoltaic panels are connected in series, they are easy to be shaded, which leads to problems such as the reduction of photovoltaic power generation efficiency. In addition, the traditional full-bridge inverter is easy to produce leakage current and reduce the safety performance of the system. In this paper, an integrated single-phase single-stage boost photovoltaic inverter topology is proposed. The AC output voltage of this structure can be higher than the DC input voltage. At the same time, it has the ability to suppress the leakage current, and avoids the direct problem of the bridge arm, which is conducive to improving the reliability of the system. The working principle, modulation strategy and steady-state characteristics of the inverter are analyzed in detail, and its main parameters are theoretically calculated and designed.