The invention discloses an energy storage power generation device, method and system based on an aerodynamic engine. An air compressor compresses air, the air is stored in an air storage tank, and theaerodynamic engine uses the stored compressed air to drive an electric generator to generate power; and through a controller, the air inlet flow or pressure of the aerodynamic engine can be adjusted,output power of the aerodynamic engine is adjusted in real time, and changes of electric generator loads are matched. The compressed air is used for directly driving the aerodynamic engine and the electric generator, the advantages of being high in comprehensive efficiency, low in cost, few in limiting condition, expandable in size, free of combustion, zero in emission and long in service life are achieved, the device is particularly suitable for peak use for valley electricity of the small and medium enterprises and families, the valley and peak electricity price difference is used, and power cost is saved. The system is also suitable for the distributed type energy managing technology, disperse energy storage resources are managed in a unified manner, the surplus is taken for supplementing the deficiency or the resources participate in power grid frequency modulation, and the maximum benefit is provided for the user.