The invention discloses a sailing track control method based on power vector, which is designed to increase the control accuracy of ship sailing track so that the ship could sail according to a preset track. The sailing track control method based on power vector comprises the following steps: measuring the preset sailing track, sailing speed, sailing direction and the position of a ship at present; calculating the sailing deviation distance from the current position to the preset sailing track wherein if the sailing deviation distance H is equal to or greater than the preset scope theta, choosing a corrected sailing track; correcting the power vector of the ship by the corrected sailing track; decomposing the power vector into control amount for various power devices and controlling the navigation of the ship. According to the invention, the sailing track can be instantly detected and controlled so as to periodically detect the deviation of the ship from the preset sailing track, to detect and choose a corrected sailing track; powered by the power vector, the ship can return to the preset sailing track along the corrected sailing track. Capable of responding rapidly and with high control accuracy of the sailing track, the method of the invention is suitable for use when the ship crosses a narrow sailing channel or when full coverage search is executed in an entire area.