Photocatalytic pavement brick capable of continuously purifying air and preparation method thereof

The invention belongs to the technical field of pavement bricks, and provides a photocatalytic pavement brick capable of continuously purifying air and a preparation method thereof. The visible light photocatalyst in the spraying raw materials is narrow in band gap, energy needed by electron transition is lower, efficient photocatalytic reaction can be achieved under the visible light condition, and the catalytic efficiency is higher. The fluorescent sand in the raw materials of the surface layer emits light at night, continuous photocatalytic reaction can still be carried out, and the working time of the photocatalytic pavement brick is prolonged. Meanwhile, the spraying raw material is sprayed to the green brick in a spraying manner, so that the visible light photocatalyst is uniformly dispersed in the surface and pores of the green brick, and part of the visible light photocatalyst is embedded into the cement which is not finally set in the green brick, so that a crystal nucleus effect can be achieved, hyd