The present invention relates to a thruster provided in a ship, and more particularly, to a high efficiency thruster comprising a propeller shaft connected to a hull, a propeller connected to a lower portion of the propeller shaft, and a duct installed to surround the propeller shaft, And the upper hollow portion is provided with a movable duct portion which is capable of protruding and retracting for a predetermined length forward so as to control the flow passing through the duct, so that the upper side area of the duct can be varied to control the flow through the duct To a high-efficiency thruster capable of improving the propulsion efficiency of the thruster through optimal flow formation.
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