The utility model discloses an ultra-high-voltage alternating-current tension tower in the shape of the Chinese character Gan for a heavy-ice zone, and the tension tower comprises a tower body, a cross arm, and jumper wire strings. The cross arm is connected with a main material of the tower body, and two side trusses of the cross arm are respectively provided with a jumper wire string hanging point. Moreover, a space, which is used for connecting a fitting, is disposed between the two jumper wire string hanging points. The jumper wire strings are connected to the two jumper wire string hanging points through the fitting. When the jumper wire strings at the front and back sides of the tower body are heavily iced along with jumper wires or icing at two sides is not uniform, a vertical load can be directly delivered to the main material of the tower body through the trusses on the front and back side surfaces of the cross arm. Compared with the structure and arrangement mode of a conventional tension tower, the tension tower provided by the technical scheme saves a jumper string support, prevents the jumper string support from causing the torque of an end part of the cross arm, shortens the force transferring path, and protects the cross arm from being twisted, thereby improving the torsion-resistant capability of the tension tower, and guaranteeing the safe operation of a power transmission line.