Non-fuel air conditioner heating system for crane and method thereof

The invention discloses a non-fuel air conditioner heating system for a crane and a method thereof. The non-fuel air conditioner heating system comprises an outdoor unit assembly, wherein the outdoor unit assembly comprises a hydraulic valve, a hydraulic motor, a gear pump set and an oil tank; hydraulic oil conveyed by a crane hydraulic pump is input into the hydraulic motor through the hydraulic valve, a shaft of the hydraulic motor is directly connected with a shaft of the gear pump set located in the oil tank, and when the hydraulic motor operates, the gear pump set operates; a first pump in the gear pump set heats the heat conduction oil in the oil tank, a second pump conveys the heat conduction oil into a warm air core body in an indoor unit assembly through a pipeline, so that the temperature of the warm air core body is increased, and the heat conduction oil returns to the oil tank from the pipeline connected with the warm air core body; an air feeder blows air to the warm air core body to transmit hea