Lifting power-assisted mechanism for cabin door of airplane

The invention provides an aircraft cabin door lifting assisting mechanism, belongs to the field of civil aircraft cabin door mechanisms, and particularly relates to a cabin door lifting assisting mechanism which is applied to a civil aircraft cabin door and can provide staged precise assisting force in a certain stage in the cabin door lifting process. The cabin door structure is fixedly connected with a power-assisted roller, the rocker arm is hinged to the cabin door structure, the rocker arm is fixedly connected with a transmission roller, the fork-shaped piece is hinged to the fuselage door frame structure, the fork-shaped piece is provided with a sliding groove and a power-assisted arm, and the lower portion of the fork-shaped piece is connected with a spring assembly. After the fork-shaped piece rotates by a certain angle, the assisting arm makes contact with the assisting roller, and the spring force of the spring assembly provides assisting force for lifting the cabin door. The power assisting device