Power grid iron tower nut antitheft combination structure and antitheft method

The invention relates to a power grid iron tower nut antitheft combination structure and an antitheft method, and belongs to the technical field of power grid iron towers and construction thereof. A nut is a cylinder; a first circular bolt through hole (8) is formed in middle of the nut; multiple first saw teeth (2) are arranged on the upper surface of the nut in the peripheral direction; the first saw teeth are arranged in the clockwise direction from high to low; the nut is arranged in a cylindrical cover; a spanner comprises a spanner head (4) and a spanner handle (5); the spanner head is connected with the spanner handle; the spanner head is a cylinder; a second circular bolt through hole (7) is formed in middle of the spanner head; second saw teeth (6) are arranged on the lower surface of the spanner head in the peripheral direction, and are matched with the first saw teeth (2); a bolt (10) penetrates through the second circular bolt through holes, the first circular bolt throughholes and circular holes