The invention discloses a capacity optimization and configuration method of wind power plant and photovoltaic electric field grid-connected power generation. By optimization and configuration on installation capacity of a wind power plant and a photovoltaic electric field, the energy storage capacity of the wind power plant and the photovoltaic electric field is optimized and configured, fans in the wind power plant are arranged in a square shape, an inverter of the wind power plant is arranged at a center of the square, photovoltaic panels in the photovoltaic electric field are arranged in around shape, an inverter in the photovoltaic electric field is arranged at a center of the round shape, stable output can be ensured during grid connection of the wind power plant and the photovoltaicelectric field, the reliability of a power grid is improved, the engineering construction cost is reduced, and the capacity optimization and configuration method has favorable application prospect.