The invention provides an energy storing method of a photovoltaic power station, and relates to the technical field of photovoltaic power stations. In the method, a plurality of photovoltaic modules,a combiner box, a photovoltaic controller, a storage battery pack, a grid-connected inverter, an electric energy meter, a power grid, a battery management system and a monitoring host are contained; the photovoltaic modules are connected with the combiner box which is connected with the photovoltaic controller, and the photovoltaic controller is connected with the lithium-iron battery pack which is sequentially connected with the grid-connected inverter, the electric energy meter and the power grid; the photovoltaic controller, the lithium-iron battery pack and the grid-connected inverter areconnected with the battery management system separately, and the battery management system is connected with the monitoring host. According to the energy storing method of the photovoltaic power station, solar energy is sufficiently utilized, the structure is simple, the power is stable, the operation cost is low, the operation is stable and reliable, the method is easy to control and safe to use,the service life is long, and the economic and social benefits are outstanding.