The invention discloses a dual-energy-storage adding virtual synchronous machine control device and a method. The device comprises a photovoltaic panel, a direct current side storage battery, an alternating current side storage battery and a load. The photovoltaic panel passes through a direct current converter and then is connected to a direct current bus. The direct current side storage batterypasses through a bidirectional direct current converter, then is connected in parallel with the photovoltaic panel and then is connected to the direct current bus. The alternating current side storagebattery passes through a bidirectional alternating current and direct current inverter and is connected to an alternating current bus. The direct current bus and the alternating current bus are connected through an inverter. The alternating current bus is finally connected to a power grid and the load is directly connected to the alternating current bus. Under control of a virtual synchronous machine, a dual-energy-storage device can stabilize a power grid frequency and a voltage by absorbing or releasing stored electric energy when a photovoltaic power station outputs and the power grid frequency fluctuates. The addition of the dual-energy-storage device is of great significance in eliminating an impact on the power grid generated during a large-capacity photovoltaic grid-connected powergeneration process.