Industrial waste gas pollutant purification device

The invention discloses an industrial waste gas pollutant purification device which comprises a shell, a flue gas inlet is formed in one end of the shell, a flue gas outlet is formed in the upper end of a protrusion at the other end of the shell, two flue gas channels are communicated with the flue gas inlet through two branch pipelines, a plurality of catalyst boxes are arranged in the flue gas channels, and catalysts are contained in the catalyst boxes. The shell is provided with a catalyst box inlet, the catalyst box inlet extends into the flue gas channel, the side wall of the flue gas channel is provided with a catalyst replacement pushing mechanism, the catalyst replacement pushing mechanism pushes the catalyst box to be discharged from the catalyst box outlet, and the catalyst box outlet is formed in the shell at the tail end of the flue gas channel. The catalyst box is replaced under the action of the catalyst replacement pushing mechanism, time is saved, manual labor is reduced, the possibility that