The invention relates to a method for preparing cerium fluoride with large particles and large specific surface area and belongs to the preparation process of materials. The method comprises the following steps of: preparing cerium oxide carbonate by taking cerium chloride or cerous nitrate as a raw material and ammonium bicarbonate as a precipitant, and fluoridizing the cerium oxide carbonate with hydrofluoric acid to obtain the cerium fluoride, which has a hexagonal crystal structure, has good dispersibility and is spherical, wherein the central particle size D50 is 25 to 41 mu m and the specific surface area is 60 to 72M<2>/g.