The utility model discloses a removing of nitrogen oxides device in adipic acid tail gas, the device include reactor, adipic acid tail gas bleeder valve, heater and gas mixing ware, be equipped with the desorption between adipic acid tail gas bleeder valve and heater before sample point and the desorption online concentration analyzer, be equipped with the feeding thermometer between heater and gas mixing ware, the import of gas mixing ware is put the tube replacement way with gas ammonia pipeline and low pressure nitrogen gas and is connected, putting the tube replacement way, low pressure nitrogen gas be equipped with low pressure nitrogen gas bleeder valve on, be equipped with reactor entry main valve and reactor entry bypass valve between gas mixing ware and reactor, be equipped with the desorption on the reactor outlet pipeline after behind the sample point, desorption concentration analyzer, blowdown piping valve and reactor outlet main valve on line, be equipped with on the reactor and import and export differential gauge and three thermometers. The utility model discloses can make catalyst steady operation under long -term high temperature, acid environment, keep its corresponding reactivity, make removing of nitrogen oxides rate and reach more than 95%.