An automatic waxing apparatus and a method thereof are provided. The automatic waxing apparatus includes a movable door-shaped module, at least a waxing module and a controlling module. The movable door-shaped module includes a door-shaped structure capable of moving with respect to the vehicle. The waxing module disposed on the door-shaped structure includes a wax-supplying unit and a wax-polishing unit. The controlling module is coupled to the door-shaped structure, the wax-supplying unit and the wax-polishing unit. The controlling module, according to the information of the vehicle, determines a moving path of the door-shaped structure, a waxing path of the wax-supplying unit, and a polishing path of the wax-polishing unit with respect to the vehicle.