The invention relates to an ozonation catalyst preparation method which includes the steps: grinding nano-fillers with rich hole diameters into porous nano-particles; dispersing the porous nano-particles in water, adding active components, adjusting mixture to reach a preset pH (potential of hydrogen), and loading the active components into the porous nano-particles; performing forming, carbonization and activation to obtain ozonation catalyst. By the aid of the technical scheme, a catalytic oxidation function can be sufficiently achieved, persistent organic matters in wastewater can be effectively removed, the utilization rate of ozone can be increased by 60% or more, and the dosage of the ozone is greatly reduced.