PY-1 water-permeable inorganic composite anticorrosive material is composed of component A (bottom coating) and component B (top coating). Component A has deep permeability to formed concrete, can penetrate into the deep layer of concrete to form crystals, seal pores and small cracks; Component B can penetrate into the surface of concrete to form a dense protective layer, so that the surface has a significant hydrophobic effect, effectively blocking the entry of external corrosive media, but will not change the appearance of the concrete characteristics and air permeability.