To address the energy waste problem during elevator operation, this solution efficiently recovers the gravitational potential energy difference generated when the elevator travels upward with a light load or downward with a heavy load, stores the energy, and reuses it for elevator power supply. The system can significantly reduce elevator operating power consumption, with a comprehensive power-saving rate of 30%-45%. It also features functions such as emergency power supply, grid stabilization, and equipment protection, comprehensively optimizing the economy, safety, and environmental friendliness of elevator operation.