The invention relates to a purification and utilization system, and concretely relates to an industrial flue gas recovery, purification and utilization system. When flue dusts in a box main body needto be removed, wedged valves are moved upwards only by wearing gloves or other members, the wedged valve leave dust exhaust tubes, the flue dusts flow out of the box main body through the dust exhausttubes, and a handle main body can be rotated as needed to make two loading frames II respectively perpendicular or parallel to the front end and the rear end of the box main body in order to switch to a one-stage filtration state or a double-stage filtration state, so the filtration efficiency is increased or the filtration effect is enhanced.