The invention discloses a reinforcement and strengthening method for a tower foot of a power transmission angle-steel tower. According to the reinforcement and strengthening method, welding strengthening is carried out on the tower foot influenced by a corrosion effect, of the power transmission angle-steel tower, through shielded metal arc welding, and the tower foot comprises the members of a diagonal member, a shoe plate, a main material, a bottom plate and a foundation bolt. The intersolubility and solubility of base metal melted in a welding joint is effectively improved, and the separation of the remainder components of intermetallic compounds and solid solution is effectively prevented through adopting a proper welding material and matching with corresponding welding process and parameters, thus welding quality can be effectively ensured, and cracks at a welding part are prevented. The reinforcement and strengthening method disclosed by the invention is simple in welding process, the shielded metal arc welding process is adopted, large equipment is not required, and the method is suitable for reinforcement and strengthening for an outdoor power transmission tower; and meanwhile, postweld heat treatment is not needed before and after welding, thus operation steps are simplified, and the welding quality is effectively ensured.