Process for preparing mesoporous ceria

Disclosed is a process for preparing mesoporous cerium dioxide, which comprises using soluble cerium salts as cerium source, charging surface active agent, pouring in precipitating agent solution for chemical reaction to produce precursor, subjecting precursor to filtering, deionized water washing, proceeding ultrasonic wave dispersion, carrying out filtering, drying, sintering to obtain the mesoporous CeO2 end product. The obtained product has homogeneous particle-size distribution, the high specific surface is as high as 40-140g/cm2, and the bore diameter is 2-20nm.