Flue gas treatment device for roasting furnace

The utility model relates to the field of flue gas treatment equipment, in particular to a flue gas treatment device for a roasting furnace. The flue gas treatment device comprises a tar treatment unit, a desulfurization unit and an air inducing unit; the tar treatment unit comprises an air cooler, a water mist cooling and wetting mechanism, a first gravity separation tank and a first centrifugal demister which are communicated in sequence, and a flue gas inlet is formed in the air cooler; the desulfurization unit comprises a desulfurization reaction mechanism, a second gravity separation tank and a second centrifugal demister which are communicated in sequence, an air inlet of the desulfurization reaction mechanism is communicated with an air outlet of the first centrifugal demister, and an air inlet of the air inducing unit is communicated with an air outlet of the second centrifugal demister. The device is small in equipment number, small in investment, low in energy consumption, free of electrostatic fiel