The invention relates to a catalyst for oxidative decyanation of cyanogens-containing waste gas and a preparation method of the catalyst and aims to solve the problem of high NOx content in tail gas treated with existing catalysts for the cyanogens-containing waste gas. The catalyst for oxidative decyanation of cyanogens-containing waste gas is prepared from components in parts by weight as follows: (1) 10-90 parts of a catalyst carrier and (2) 0.1-65 parts of tungsten oxide. With the adoption of the technical scheme, the problem is better solved and the catalyst can be used for removing cyanides in the cyanogens-containing waste gas.