The invention relates to a catalyst for ozone decomposition and a method for preparing the same. The catalyst uses activated carbon particles or activated carbon fiber as a carrier, and uses manganese, nickel, silver, and cerium as active components of the catalyst. The method for preparing the catalyst comprises the following steps: A. mixing the same volume of a manganese nitrate solution, a nickel nitrate solution, a silver nitrate solution and a cerium nitrate solution to prepare an active component solution; B. selecting the activated carbon particles or the activated carbon fiber as thecatalyst carrier, immersing the carrier in the prepared active component solution, and then taking out the carrier for washing and drying; C. taking out the carrier and immersing the carrier in a sodium carbonate solution; and D. taking out the carrier for washing, drying, and baking to obtain a finished product of the catalyst. The method for preparing the catalyst has the advantages of simple process, high ozone decomposition efficiency, low cost, stable performance, long service life, and wide application prospect.