The utility model relates to a large-area open type operating area closing and gas collection treatment facility, which comprises an inflating film and an air feeder which are connected by an air supply duct, wherein an air tight door is arranged on the inflating film, and the upper end of the inflating film is connected with automatic control and detection equipment through a line; and the lower end of the inflating film is connected with gas treatment equipment through a collection pipeline, and the gas treatment equipment is connected with an air exhaust pipe through an air exhauster. The utility model has the beneficial effects that: the original unorganized gas emission of contaminated gas generated in a contaminated soil treatment area, a composting disposal area, a hazardous waste disposal area, a landfill operation area and other large-area open operating areas is changed into organized emission, and the gas emission is up to the national emission standards; and the groundwater contamination generated by precipitation infiltration in the contaminated soil treatment area, the composting disposal area, the hazardous waste disposal area, the landfill operation area and other large-area open operating areas can be reduced.