NOVELTY - Preparing lean-burn natural gas vehicle catalyst, comprises: (i) adding alumina, salt additives, ceria-zirconia materials into water, and stirring, ball milling into slurry; (ii) immersing cordierite honeycomb ceramic carrier into the slurry, extracting the redundant slurry, then sizing, and drying the cordierite honeycomb ceramic carrier, and calcining; (iii) immersing the dried cordierite honeycomb ceramic carrier into noble metal solution; and (iv) taking out the cordierite honeycomb ceramic carrier and drying, and roasting.    USE - The catalyst is useful for high efficient catalytic oxidation of methane.    ADVANTAGE - The catalyst has simple preparation process, low ignition temperature of the methane, high conversion rate of the methane, low cost, and good aging resistance.    DETAILED DESCRIPTION - Preparing lean-burn natural gas vehicle catalyst, comprises: (i) preparing slurry: adding 5-10 pts. alumina, 3.5-7 pts. salt additives, 4.5-9 pts. ceria-zirconia materials into 13-25 pts. water, and stirring for 1-3 hours to fully mix, ball milling into slurry, where the slurry particle size is 5-30 mu m, adjusting the pH to 2-7 using 0.05- 0.1 mol/l dilute nitric acid, where the slurry viscosity is 500-3000cpi; (ii) sizing and drying: using a suction type coating machine to adjust the gas pressure to 0.1-0.5 MPa, immersing cordierite honeycomb ceramic carrier into the slurry, extracting the redundant slurry, then sizing, and drying the cordierite honeycomb ceramic carrier for 2-6 hours, and calcining at 450-600 degrees C for 2-4 hours; (iii) preparing noble metal impregnating solution: adding 8-12 pts. palladium nitrate and 1-2 pts. chloroplatinic acid into 20-25 pts. water, fully and uniformly stirring to obtain the noble metal solution, and immersing the dried cordierite honeycomb ceramic carrier into the noble metal solution; and (iv) post-treatment: taking out the cordierite honeycomb ceramic carrier and drying for 2-6 hours, and roasting for 2-4 hours at 450-600 degrees C.