Iron oxide pigment is a kind of pigment with good dispersibility, excellent light and weather resistance. Iron oxide pigments mainly refer to iron oxide red, iron yellow, iron black and iron brown pigments with iron oxide as the basic material. Among them, iron oxide red is the main color (accounting for about 50% of iron oxide pigment). Mica iron oxide used as antirust pigment and magnetic iron oxide used as magnetic recording material also belong to the category of iron oxide pigment. Iron oxide is the second largest inorganic pigment after titanium dioxide and the first color inorganic pigment. In the total consumption of iron oxide pigment, more than 70% is prepared by chemical synthesis method, called synthetic iron oxide. Synthetic iron oxide is widely used in building materials, coatings, plastics, electronics, tobacco, medicine, rubber, ceramics, ink, magnetic materials, papermaking and other fields because of its high purity, uniform particle size, wide chromatography, many colors, low price, non-toxic, excellent coloring and application performance, UV absorption and other properties.