The utility model belongs to the technical field of waste gas treatment, and in particular relates to a nitric oxide waste gas treatment device. The nitric oxide waste gas treatment device comprises a pickling unit with a plurality of serially connected pickling absorption towers, a washing unit which is arranged behind the pickling unit, is connected in series with the pickling unit and comprises washing absorption towers, an alkaline washing unit which is arranged behind the washing unit, is connected in series with the washing unit and comprises alkaline washing absorption towers, and a draught fan of which an inlet is connected with the waste gas exhaust ports of the alkaline washing absorption towers and an outlet is connected with an inlet of a gas and liquid separator, wherein waste gas inlets and liquid outlets are formed in the bottoms of the absorption towers; waste gas exhaust ports and liquid inlets are formed in the tops of the absorption towers; an air inlet is formed in the top of the first pickling absorption tower; an extraction pump is arranged on each absorption tower; inlets and outlets of the extraction pumps are respectively connected with the liquid outlets and the liquid inlets; and a gas exhaust port of the gas and liquid separator is connected with a gas inlet of a dry type adsorption tower. The problem that the existing treatment device can only absorb NO2 and cannot absorb NO and the problem of secondary pollution caused by a large amount of industrial waste salt produced in a waste gas treatment process are solved.