The invention discloses a road pavement brick for degrading automobile waste gas. The road pavement brick comprises a brick body, wherein a brick surface layer is arranged on the surface of the brick body, and the road pavement brick is characterized in that the brick surface layer is made of a breathable surface layer mixed material, the breathable surface layer mixed material comprises cement, nano-scale optical composite photocatalyst, middle-coarse sand and water, and the weight ratio of cement to nano-scale optical composite photocatalyst to middle-coarse sand is equal to 1 to (0.12-0.14) to (2-2.5). The nano-scale optical composite photocatalyst is nanometer anatase powder. The thickness of the brick surface layer is 3mm to 5mm. By adding the high-ratio nano-scale optical composite photocatalyst anatase powder into the surface layer material of the road pavement brick, the road pavement brick has the characteristic for degrading the automobile exhaust in the presence of the catalyst. The road pavement brick has the advantages that the automobile exhaust can be effectively degraded, the concentration of harmful gas in the urban air can be reduced, and the pollution of the exhaust of locomotives can be alleviated.