Nanomaterials can greatly block the surface pores of polished bricks, repair micro-cracks, form a dense protective film on the surface of polished bricks, and greatly prevent the dirt from penetrating into the brick and combining with the brick surface. Even if the dirt with strong binding force and permeability falls on the broken surface, it can be easily cleaned with a touch cloth and a small amount of water, so that the brick surface will be fresh for a long time. Nanomaterials are a kind of material with excellent transparency, which will not affect the color of the brick, will not produce color difference, and can greatly improve the surface finish of the polished brick (up to 90C or more). The effective component of the super nano antifouling liquid is inorganic nanomaterials, which has antibacterial and self-cleaning functions, so that the polished brick is free from bacterial invasion, so that it does not change color for a long time and maintains youth forever.