The invention discloses a photovoltaic power generation single phase grid-connected inverter, comprising an inverter circuit, a filter circuit, a digital signal processor (DSP) main control unit, a signal detection unit, a protection circuit, a power frequency isolation transformer, an inversion drive circuit, an auxiliary power supply circuit, a man-machine interaction module, and a parallel operation communication interface. The inverter circuit is of a single-phase whole bridge structure, the direct current is sent to the power frequency isolation transformer for the isolation and the boosting after being subject to the inversion and the filtration. The signal detection unit samples the direct current voltage, the current and alternating current side grid-connected current and the grid voltage signal, which are processed by the DSP main control unit to generate a space vector pulse width modulation (SVPWM) signal, the SVPWM signal drives the inverter circuit to work through the inversion drive circuit, and the protection circuit can blockade protection of the inversion drive circuit to the grid-connected inverter. The grid-connected inverter of the invention has the advantage of stable voltage output, the direct current voltage efficiency of the solar battery can reach more than 95%, and the power generation factor is higher than 0.95.