Energy-saving elevator and energy-saving method of elevator

The invention discloses an energy-saving elevator. The energy-saving elevator comprises a hoistway, a lift car, a linear motor, an energy-saving device and a frequency converter. The lift car is located in the hoistway and connected with the inner wall of the hoistway in a sliding mode. Each linear motor comprises a primary module and a secondary module, the primary modules are installed on the lift car, the secondary modules are installed on the hoistway, and the primary modules and the secondary modules are oppositely arranged. The energy-saving device comprises a storage battery and a converter, and the converter is connected to the storage battery. The frequency converter comprises a rectifier module, a direct-current module and an inverter module, the direct-current module is connected with the rectifier module and the inverter module, the inverter module is connected to the linear motor, and the converter is connected to the direct-current module. Energy generated under the power generation working cond