The invention discloses a method for adjusting phase sequence arrangement of an electric transmission line wire according to electric transmission line power. The method solves the problems that transmission power of an existing electric transmission line is low, and the system static stability is reduced. The method comprises the steps of setting up a simulation calculation model of the electric transmission line according to the adopted tower type size, wire phase sequence arrangement, real parameters of the wire and the real length of the line of a same-tower double-circuit electric transmission line, utilizing an electromagnetic transient calculation method for calculating active power and reactive power transmitted by the electric transmission line under the condition of the phase sequence arrangement actually operated by the electric transmission line, changing the phase sequence arrangement of the electric transmission line wire, calculating active power and reactive power transmitted by the electric transmission line of a new model again until 36 phase sequences of the same-tower double-circuit electric transmission line are all calculated, and finding out the phase sequence arrangement mode with the largest active power transmitted by the electric transmission line. The auxiliary adjusting determining method is provided for the phase sequence arrangement of the same-tower double-circuit electric transmission line.