Nano-titanium dioxide, also known as nano-titanium dioxide, is a kind of white loose powder with the characteristics of anti-ultraviolet, anti-bacteria, self-cleaning and anti-aging. It can be used in cosmetics, functional fibers, plastics, coatings, fine ceramics and other fields as an ultraviolet shielding agent to prevent ultraviolet rays from invading. In addition, it also has high chemical stability, thermal stability, non-toxicity, super hydrophilicity and so on. And can completely contact with food, so it is widely used in textile, food packaging materials, paper industry and aerospace industry.