Movable sail and sail adjusting method

The invention relates to a movable sail and a sail adjusting method. The movable sail comprises a sail base and a slewing mechanism, and an auxiliary supporting sail surface is connected to the slewing mechanism; the top of the auxiliary supporting sail surface is rotationally connected with a main sail surface, the slewing mechanism rotates in the horizontal plane and comprises a slewing motor, an output shaft of the slewing motor is coaxially connected with a slewing gear, the tooth surface of the slewing gear is meshed with an inner tooth type slewing supporting bearing, the auxiliary supporting sail surface is fixedly mounted at the top of the inner tooth type slewing supporting bearing, and an included angle between the auxiliary supporting sail surface and the main sail surface is adjusted in a vertical plane; the auxiliary supporting sail surface and the main sail surface are rotationally connected through a rotating shaft; a rotating flange is fixedly mounted on the rotating shaft; and a swing electri