Nano coating refers to coating materials prepared by advanced nano-level technology, which is a nano coating technology with high scientific and technological content. This high-tech nano coating is not only environmentally friendly, but also can slowly release a substance to degrade harmful substances such as formaldehyde and xylene. The extremely fine nano structure can also form a breathable protective film to effectively reduce the surface energy of objects, just like the surface of lotus leaves, which can achieve an ultra-high hydrophobic effect, thereby achieving the purpose of waterproofing, anti-corrosion and anti-oil pollution.