The utility model provides a well ice formation 500kV alternating current transmission 20~40 angle towers, includes that body of the tower and top -down set up ground wire cross arm, upper conductor cross arm and lower wire cross arm on the body of the tower, and the ground wire cross arm sets up at the top of body of the tower, and the interior angle side at the body of the tower is established to the upper conductor cross arm, and the both sides at the body of the tower are all established with lower wire cross arm to the ground wire cross arm, the top of ground wire cross arm is equipped with the ground wire and hangs the point, the bottom of upper conductor cross arm and down the both sides bottom of wire cross arm all be equipped with the wire and hang the point, the body of the tower is equipped with and becomes slope department in the below of wire cross arm under, and the plane be the rectangle on the ground wire cross arm of body of the tower exterior angle side, the wide 2.203m that is of tip mouth, and the upper conductor cross arm is rectangle, wide 3.30m and the 4.649m of being respectively of tip mouth with the lower plane of lower wire cross arm, the ground wire cross arm is 8.0m with the interlamellar spacing of upper conductor cross arm, the upper conductor cross arm is 9.5m with the interlamellar spacing of lower wire cross arm, the tower leg is connected to the body of the tower bottom, and this tower has alleviateed the tower weight, saves the tower material.