The invention discloses a novel three-circuit power transmission tower which comprises a tower body, wherein a cathead structure is arranged above the tower body; a two-circuit structure is arranged below the tower body; earth wire peaks are arranged on two sides of the top of the cathead structure; a cross arm is arranged between the two earth wire peaks; two cross arms are arranged on two sides of the lower part of the cathead structure; the two-circuit structure is composed of an upper-phase cross arm, a middle-phase cross arm and a lower-phase cross arm; the middle-phase cross arm is arranged below the upper-phase cross arm; the lower-phase cross arm is arranged below the middle-phase cross arm; each of the upper-phase cross arm, the middle-phase cross arm and the lower-phase cross arm is composed of two cross arms on two sides of the tower body. According to the invention, the arrangement that the cathead structure is arranged above the tower body and the two-circuit structure is arranged below the tower body is adopted, and three circuits of power transmission lines can be erected with the tower, so that a line corridor is greatly reduced.