The invention discloses a preparation method of high-gloss rutile titanium dioxide. The preparation method comprises the following steps: grinding titanium dioxide slurry obtained by adopting a sulfuric acid process or a chlorination process through a sanding process, and performing heating, zirconium coating, aluminum coating, subsequent water washing, organic treatment and jet milling in sequence to obtain finished high-gloss rutile titanium dioxide, wherein the slurry is cooled in an indirect heat exchange way, ground for more than 5 minutes, heated to 45-55 DEG C and subjected to the aluminum coating after the zirconium coating. According to the method, titanium dioxide aggregates formed due to the pH change are depolymerized, so that the dispersity of titanium dioxide particles can be improved, the subsequent aluminum coating can be carried out in a state that the titanium dioxide particles are fully dispersed, the titanium dioxide particles are fully subjected to the aluminum coating, the dispersity of titanium dioxide is improved, the glossiness of titanium dioxide is also improved, and the high-gloss rutile titanium dioxide is obtained.