Composite coating applicable to high altitude as well as preparation method and application of composite coating

The invention relates to a composite coating applicable to high altitude as well as a preparation method and application thereof. The composite coating comprises a first electric heating layer, a second electric heating layer and a super-hydrophobic layer which are sequentially stacked, the first electric heating layer comprises a resin matrix and silver-plated copper, the second electric heating layer comprises a resin matrix and a multi-walled carbon nanotube, and the super-hydrophobic layer comprises a resin matrix, silicon dioxide and hexadecyl trimethoxy silane. The formula of the composite coating is designed, the resin matrix with good adhesive force with the metal base material of the ultra-high-voltage power transmission and transformation facility is selected and cooperates with key raw materials such as hexadecyl trimethoxy silane, silver-plated copper, multi-walled carbon nanotubes and silicon dioxide, the composite coating is prepared, and the composite coating has the hydrophobic and anti-icing