Potassium permanganate alumina ball was prepared by high activity, high adsorption ability and large pore size active alumina ball as carrier, and was prepared by drying and impregnating potassium permanganate solution. Potassium permanganate alumina ball uses the strong oxidation of potassium permanganate to oxidize and decompose the harmful gases in the air, so as to purify the air. The harmful gases hydrogen sulfide, sulfur dioxide, chlorine and formaldehyde can be adsorbed. Nitric oxide, etc.