The invention is an inorganic nanopowder paint and its preparing method, using natural or synthetic resin as a substrate, adding in pigment, filling, dispersed and coupled inorganic metal oxide nanopowder, additive and auxiliary solvent to mechanically manufacture it. It is a new-generation high-grade paint prepared of inorganic metal oxide and oily coating. The nanopowder is made by routine pain preparing method after dispersing and coupling processing. The advantaegs are special and simple preparing process and excellent quality and has stronger adhesion, excellent anticorrosive and mechanical properties.