Waste gas treating device and waste gas treating method for production process of copper sulfate

The invention discloses a waste gas treating device for the production process of copper sulfate. The waste gas treating device comprises a reaction kettle, a spraying tower, a water tank and an exhaust fan, wherein water distributors are arranged in the spraying tower; a water outlet of the water tank is connected with the water distributors through a water pump and a pipeline; a first exhaust opening is formed in the top end of the spraying tower and is connected with an air inlet of the exhaust fan through a first exhaust pipe; an exhaust pipeline is connected to an air outlet of the exhaust fan; a second exhaust opening is formed in the top of the reaction kettle; the mounting position of the spraying tower is higher than that of the second exhaust opening; an air inlet is formed in aposition, close to the bottom, of the side face of the spraying tower; the second exhaust opening is connected with the air inlet by a condensing pipe; the water tank is used for storing purified water; a recovering port is f