The invention provides a triangular fracture surface angle steel tower for a power transmission line. The angle steel tower comprises cross arms, a tower body, tower legs and a ground wire support. The upper cross arm, the middle cross arm and the lower cross arm are sequentially arranged on the tower body from top to bottom, the tower body is connected with the tower legs to transmit loads to the ground plane, and the ground wire support is installed at the ends of the upper cross arm. According to the triangular fracture surface angle steel tower for the power transmission line, it is guaranteed that the tower body is reliably connected with the cross arms, and the fracture surface of the tower body is in a triangular shape because of connection nodes of the tower body and the cross arms; in addition, when cold-bending 60-degree angle steel is adopted as main materials of the tower body, duckbilled cross arms frequently used for a quadrilateral tower can still be adopted as the cross arms of the angle steel tower, and common hot rolling angle steel is adopted for main materials of the cross arms and auxiliary materials of the cross arms.