The embodiment of the utility model discloses an alternating current and extra-high voltage tangent tower in a heavy ice area. The alternating current and extra-high voltage tangent tower comprises a first main column and a second main column which are arranged in parallel and further comprises a wire cross arm arranged on the top of the first main column and the top of the second main column, and the wire cross arm is connected with the first main column and the second main column. According to the alternating current and extra-high voltage tangent tower in the heavy ice area, an n-shaped framework structure is adopted to replace a wine-glass-shaped framework structure in the prior art, a 'K' node is omitted, and the problem that the safety and reliability of the tangent tower are reduced due to the deformation of the 'K' node is solved.