Catalyst for preparing naphthaquinone and preparation method thereof

The invention relates to a catalyst for preparing naphthaquinone and a preparation method thereof. The catalyst consists of a carrier, a main catalyst and a cocatalyst, wherein the carrier is silica gel, the main catalyst is V2O5, and the cocatalyst comprises K2SO4, K2S2O7, SnSO4, KH2PO4 and Na2B4O7.10H2O. The catalyst can improve the yield of the naphthaquinone by between 35 and 43 percent, improve the selectivity by 28 to 32 percent, and reduce the production cost for the naphthaquinone. The catalyst has the advantages of simple and convenient production, low cost, high yield and selectivity, no need of special equipment and the like. Through the research on an oxidation-reduction mechanism of the catalyst, an experimental result shows that the induction period of the catalyst is approximately 3,000 minutes or so.