The invention relates to a photovoltaic-energy storage combined operation power generation system based on a virtual synchronous generator control strategy and a control method thereof. The system istechnically characterized by comprising a photovoltaic-energy storage power generation system, a measuring component, a three-phase load and an alternating current power grid, wherein the photovoltaic-energy storage power generation system comprises a photovoltaic array, an energy storage battery, a photovoltaic direct current converter, a photovoltaic inverter and an energy storage inverter; andoutput ends of the photovoltaic inverter and the energy storage inverter are connected to a power grid alternating current bus. In the invention, the virtual synchronous generator control strategy isadopted by the energy storage inverter; and the operating characteristics of a synchronous machine with inertia and damping are adjusted by adjusting the energy storage device, so that the overall external characteristics of the photovoltaic and energy storage device are similar to the operating characteristics of the conventional synchronous machine. The own output power of the system can be adjusted for the photovoltaic output fluctuation and the load fluctuation, the frequency and voltage fluctuation of the photovoltaic system are stabilized, and the dynamic performance of a photovoltaic grid-connected plant is effectively improved.