Preparation method of titanium dioxide pigment

The invention belongs to the field of titanium dioxide production, particularly relates to a preparation method of a titanium dioxide pigment, and aims at solving the technical problem of providing a preparation method of a titanium dioxide pigment which is high in weather fastness and relatively friendly to environment. In order to solve the technical problem, according to the technical scheme, the preparation method comprises the following steps: firstly, carrying out silica coating on a silica primary product; then carrying out aluminum phosphate coating; and finally, carrying out alkaline coating on aluminum oxide to form a boehmite type aluminum oxide coating. According to the invention, coating is carried out by adopting the method, so that the light resistance and the weather fastness of the product are improved, and meanwhile, the dispersing performance of the product is also improved. According to the method, the addition of the phosphoric acid is relatively low, the generated free phosphoric acid is little, so resource waste is avoided, and the method is relatively friendly to environment.