The invention relates to a power supply capacity and power grid load-based automatic control method of a virtual power plant. With the method adopted, defects in the prior art can be eliminated. According to the technical schemes of the invention, the virtual power plant includes power generation units, power consumption units, a dispatching center station and a local data acquisition device; the local data acquisition device is in communication connection with the power consumption units and the power generation units; the local data acquisition device is in communication connection with the dispatching center station; the power generation units and the power consumption units are both connected with a power grid through controllable interfaces; and the controllable interfaces are connected with the dispatching center station. The method is characterized in that the power generation units may include power generator sets and/or energy storage devices; each energy storage device is at least connected with one power generator set; each power generator set is connected with the corresponding energy storage device through one controllable interface; a plurality of switchable units are configured in the virtual power plant; and the switchable unit comprises a switching unit energy storage device and a switching connection port.