The utility model relates to a three-phase photovoltaic grid-connected power generation inverter. The inverter comprises a two-bridge-arm four-switch full-bridge topological structure, a transformer,a two-bridge-arm four-diode full-bridge topological structure, a first inductor, a first capacitor, a three-bridge-arm six-switch full-bridge topological structure, a second inductor, a third inductor, a second capacitor and a resistor. The output end of the direct-current power supply is connected with the input end of the two-bridge-arm four-switch full-bridge topological structure; the invertercan realize a direct power control strategy based on direct current side maximum power tracking in combination with droop control characteristics, has primary voltage regulation and frequency modulation performance, and is beneficial to realization of distributed power generation and optimal operation of a power grid system.