The invention provides a catalyst for preparing ozone by using waste clay and a preparation and application thereof. The method comprises the following steps of: the waste clay is pyrolyzed to prepareclay-charcoal; the obtained clay-charcoal, pseudo-boehmite and a precursor of metal oxide are uniformly mixed and molded; wherein the mass percentage of each component is: 30-50% of the clay-charcoal, 50-70% of pseudo-boehmite and 0-8% of the precursor of the metal oxide, wherein the total mass of the components is 100%; drying and roasting the obtained molded product; the loading active components of cerium and vanadium on the obtained roasted product to obtain the catalyst for ozone catalytic oxidation; wherein the mass percentage content of CeO2 is 1-10% and the mass percentage content ofV2O5 is 1-3% according to the oxide form and based on the total mass of the prepared catalyst being 100%. The invention prepares the ozone catalytic oxidation catalyst which is low in cost and environment-friendly.