The present invention provides a droop control method of a voltage source inverter for a photovoltaic energy storage independent microgrid. Each photovoltaic power generation unit is taken as an independent controlled voltage source with no need for communication signals between distributed generations so as to avoid the constraint of the physical connection and ensure the high reliability of the system. Through adoption of the adaptive droop control equation, a direct current side voltage PI regulator is introduced to control the direct current side capacitor voltage to be equal to the direct current side given reference voltage and regulate the active-frequency curve to move up or down so as to ensure the output powers of other photovoltaic power generation units are not influenced when the output power of one of the photovoltaic power generation units is changed, allow each photovoltaic power generation unit to output with the maximum power, improve the service life of the energy storage unit and provide auxiliary contribution for the frequency support of the system.