Industrial kiln flue gas denitration device containing high-concentration NOX

The utility model relates to the field of flue gas treatment, and provides an industrial kiln flue gas denitration device containing high-concentration NOX aiming at the problems of sintering inactivation of a catalyst, large resistance drop of a multi-stage series reactor and large ammonia escape amount caused by temperature runaway in high-concentration NOX flue gas treatment, which comprises a mixer, a denitration reactor, a secondary heat exchanger, an induced draft fan and a desulfurization tower which are connected in sequence, the flue gas and the reducing agent are mixed in the mixer; the denitration reactor is of a radial barrel structure and sequentially comprises an inner barrel, a middle barrel catalyst layer and an outer barrel from inside to outside. A hot air outlet end of the secondary heat exchanger is communicated with an inlet of the mixer through a first pipeline, a primary reducing agent feeder is arranged in the first pipeline, and the primary reducing agent feeder is communicated with r