The invention provides a hydrogen peroxide oxidation combined amino wet desulphurization and denitration method and device. Firstly, an amino solution is used for removing sulfur dioxide with high efficiency to obtain a sulfite solution having reductibility; secondly, hydrogen peroxide is decomposed on the surface of a catalyst to obtain nitric oxide in high-activity free radical high-efficiency oxidation desulphurization gas; and finally, sulfite solution and nitric oxides are mixed and react to realize an aim of highly effectively absorbing the nitric oxides, so that a competitive relation formed by reaction of sulfur dioxide and nitric oxide with high-activity free radicals is avoided, the consumption quality of an oxidizing agent is saved, and the reductibility of the sulfite solution can be used for reducing part of the nitric oxides to obtain nitrogen. The method and the device can be used for solving the technical problems that the denitration efficiency is low, the oxidation efficiency is low, the running cost is high and the like in a traditional pollutant removing process, a liquid-phase high-efficiency removal smoke products and product recycling type desulphurization and denitration mode is built, and the classification conversion of pollutants in a two-stage tower can be realized.