The utility model relates to a transmission line is with narrow basic angle -steel tower, include the body of the tower of vertical setting and transversely set up a plurality of electric wire mounting brackets on the body of the tower, the body of the tower is equipped with a tower bight branch from bottom to top in order, a plurality of toper support frame part and vertical support frame part, four main materials including locating the outside are divided in the tower bight, a plurality of oblique material of cross arrangement, locate the horizontal material of the upper end between each main material, it all is connected with the main brace to put at each horizontal material central point between the connected main material lower extreme, it all is connected with pole at the same place between putting to put connected main material central point at each main brace central point, all be connected with oblique material between pole and main material tie point to main brace and the horizontal material tie point respectively taking, all be connected with oblique material between pole and main brace tie point to main material and the horizontal material tie point respectively taking. The utility model discloses the aspect ratio is great, the use is taken up an area of less, economic nature is good, make things convenient for transmission line construction and operation maintenance, is favorable to shortening the city transmission line construction cycle for city circuit design construction progress.