The invention discloses a method for preventing a power grid electric transmission line iron tower from icing. The method for preventing the power grid electric transmission line iron tower from icing comprises the following steps that (1) a layer of teflon coats the surface of rolled steel of the iron tower, (2) high temperature solidification is carried out on the rolled steel at 80 DEG C, and (3) the thickness of the teflon is no less than one micron. According to the method for preventing the power grid electric transmission line iron tower from icing, the teflon coats the surface of the iron tower, the requirements of anti-icing of the iron tower are met, the teflon is stable in chemical and physical performance, and resistant to ultraviolet, the iron tower can work for a long time under the conditions of high temperature of hundreds of degrees and low temperature below minus fifty degrees, and the service life of the iron tower is prolonged. The method for preventing the power grid electric transmission line iron tower from icing is simple and convenient to operate, and solves the existing problems that consumption of rolled steel is increased and capital investments are large by adopting the anti-icing measures on the lines of improving the intensity of the iron tower better.