Automobile exhaust gas treatment catalyst and preparation method thereof

The invention relates to the technical field of automobile exhaust gas purification, and concretely relates to an automobile exhaust gas treatment catalyst and a preparation method thereof. The catalyst comprises a carrier, and the carrier is sequentially coated with a first catalyst coating, a second catalyst coating and a third catalyst coating; the first catalyst coating is a lanthanum-modifiedoxygen storage material coating, and is formed by loading lanthanum on an oxygen storage material; the second catalyst coating is a barium-modified alumina supported active component coating, and iscomposed of a barium-modified gamma-Al2O3 supported active component; and the third catalyst coating is a coating material of meso-porous AcF micro-powder supported with and wrapping a precious metal.The catalyst has the advantages of high catalytic activity, great reduction of nitrogen oxides, carbon monoxide, hydrocarbon carbon and other series of pollutants in discharged automobile exhaust gas, good heat resistance, goo