The invention relates to a method for preparing a titanium-rich material. The method for preparing the titanium-rich material comprises the following steps: wet-milling, namely, performing wet-milling treatment on acid molten slag and a modifier for 25-35 minutes so as to obtain a mixed material, wherein the mass ratio of the acid molten slag to the modifier is (1-2) to 1, the modifier is a solid mixture of NaOH and Na2CO3, and the mass ratio of Na2CO3 to NaOH is (15-20) to 1; roasting, namely, drying the mixed material, and roasting for 1-2 hours at 900-1000 DEG C; acid-leaching, namely, performing acid-leaching twice at normal temperature, leaching at normal pressure; and performing aftertreatment. In the acid-leaching process, the concentration of sulfuric acid is 10-20%, the mass ratio of acid to slag is (5-15) to 1, the temperature is 100-110 DEG C, the time is 1-2 hours; and in the second acid-leaching, the concentration of sulfuric acid is 20-30%, the mass ratio of acid to slag is (5-15) to 1, the temperature is 105-115 DEG C, and the time is 1.5-2.5 hours;. By adopting the method, the titanium-rich material of which the TiO2 grade is greater than 90% can be prepared, and the recycling rate is 92-97%.