The invention discloses a method for preparing an ozone catalyst by a stepped gradient heating calcining method and application thereof, and belongs to the field of environment-friendly materials. Themethod comprises the following steps: adding water into an aluminum-based precursor material, and uniformly stirring so as to obtain an active precursor material; drying the active precursor materialto obtain an active material; and roasting the active material to obtain the ozone catalyst, wherein the roasting method is a program step type gradient heating calcining method. According to the method disclosed by the invention, the efficiency of removing TOC from the ozone catalyst in the wastewater can be effectively improved, the catalyst is prepared by adopting the method, the steps are simple, the control is easy, and the mass production of the high-efficiency ozone catalyst is facilitated.