The invention relates to a telescopic
fin stabilizer for an unmanned ship, a
control system and a control method, the
fin stabilizer comprises a fin blade part, a first power mechanism, a first transmission mechanism, a fin shaft and a fin shaft
limiter, and the fin blade part comprises a main fin unit, a second
power unit, a second transmission mechanism and an auxiliary fin; the first power mechanism is connected with the fin shaft through the first transmission mechanism, the fin shaft is connected with the main fin unit and used for achieving unfolding and folding of the main fin unit, andmeanwhile the fin shaft
limiter is installed on the first transmission mechanism and used for preventing the main fin unit from excessively stretching and locking the working state. The auxiliary finis mounted on the main fin unit, is connected with the second
power unit through the second transmission mechanism, and is used for controlling the auxiliary fin to extend when the anti-
rolling moment of the main fin unit is insufficient. Compared with the prior art, the telescopic
fin stabilizer has the advantages that occupation of the internal space of the unmanned ship is reduced, enough anti-rolling torque can be provided under the condition that the navigational speed is not affected as much as possible, and the like.