The invention discloses an electric power system energy storage control method of large-scale photovoltaic access. The method comprises following steps that step 1, a photovoltaic power station is connected into a power transmission network and a power distribution network according to output voltage grade, a power-type energy storage system is configured in the power distribution network and an energy-type energy storage system is configured in the power distribution network; step 2, the power-type energy storage system adopts a double moving average algorithm to calculate an energy storage charging and discharging strategy, and stabilize short-time fluctuation of output power of the photovoltaic power station accessed to the power distribution network; and step 3, the energy-type energy storage system firstly carries out power generation detection on the photovoltaic power station accessed to the power transmission network and the power distribution network, carries out load prediction on the load accessed to the power distribution network so as to obtain a predicted photovoltaic output curve and a predicted load curve, then adopts a prediction control method, makes a daily operation plan, stores energy during photovoltaic power releasing period and generates power during load period at night.