The invention provides anti-icing nano-paint for surfaces of ultra-high-voltage lines in mountainous areas. The anti-icing nano-paint comprises raw materials in parts by weight as follows: 35-55 parts of fluoro-siloxane resin, 6-10 parts of a light-absorbing pigment, 2-4 parts of nano-TiO2, 6-12 parts of nano-SiO2, 0.3-1 part of a dispersing agent, 0.5-1 part of a defoaming agent, 0.3-1 part of a levelling agent, 1-3 parts of a preservative bactericide and 20-40 parts of a solvent. The prepared anti-icing nano-paint for the surfaces of the ultra-high-voltage lines in the mountainous areas has a contact angle ranging from 129 degrees to 168 degrees with water, the higher light absorptivity ranging from 0.92 to 0.96 and the lower emissivity ranging from 0.16 to 0.28 and is resistant to acid and alkali and high in adhesion.