The invention provides a method for preparing a titanium tetrachloride hydrolyzed crystal seed. The method comprises the following steps of mixing titanium tetrachloride and pure water to obtain a titanium tetrachloride aqueous solution, mixing the titanium tetrachloride aqueous solution and alkali liquor with full stirring to obtain a neutralized material, heating the neutralized material to a peptization temperature for peptization so that peptized slurry is obtained, adding pure water into the peptized slurry for cooling of the peptized slurry, adding alkali liquor into the cooled peptized slurry for neutralization until a pH value of the cooled peptized slurry is in a range of 7.0 to 11.0, adding pure water into the neutralized peptized slurry, standing for sedimentation, and removing supernatant to obtain the titanium tetrachloride hydrolyzed crystal seed. The method provided by the invention has simple processes and a low cost. The titanium tetrachloride hydrolyzed crystal seed has high rutile content and good stability. The titanium tetrachloride hydrolyzed crystal seed obtained by the method can be utilized for preparation of a rutile titanium white product having high quality.