Smelting flue gas treatment device capable of conveniently separating dust and particulate matters

The utility model discloses a smelting flue gas treatment device convenient to separate dust and particulate matters, which relates to the field of smelting flue gas and comprises a treatment main box, a discharge pipeline is vertically and upwards welded on the top surface of the treatment main box, and a fixed flange is horizontally welded at the top end of the discharge pipeline. A fixing frame is horizontally welded to the outer side edge of the treatment main box, fixing through holes are evenly formed in the top face of the fixing frame, material leakage side pipes are symmetrically and obliquely welded to the two side edges of the treatment main box, side clamping grooves are horizontally and evenly formed in one side edge of the treatment main box, and a sealing cover plate is horizontally clamped to the inner side edges of the side clamping grooves. A handle groove is horizontally formed in one side edge of the sealing cover plate, a detachable structure is adopted so that follow-up replacement and c