The invention discloses an anti-corrosion working method for a down conductor of a transmission line as well as a special template, belongs to the field of anti-corrosion methods of devices connected with earth's materials, and aims to solve the problem of corrosion of the down conductors in the prior art. The template comprises a flake-like elastic cylindrical template body and fasteners, wherein the fasteners tightly close the elastic cylindrical template body and enable the elastic cylindrical template body to be closed to form a cylindrical mold. When the template is adopted to build a protective layer of the down conductor, corrosion resistance can be realized, the anti-corrosion period is long, and an anti-theft effect can be realized.