The utility model relates to a dismountable dust-proof chamber for the outdoor construction of electric engineering, which comprises inflating wall surfaces, a top roof, a metal frame and an inflating pump, wherein the bottom of the inflating wall surfaces is provided with the metal frame which is used for fixation; the top roof is arranged on the top of the inflating wall surfaces; the inflating wall surfaces are connected by cable loops; the top roof and the inflating wall surfaces are connected by cable loops; the number of the inflating pump is at least one; and the inflating pump is respectively connected with the inflating wall surfaces and the top roof. Compared with the prior art, the utility model has the advantages that the heat insulation performance is good; the top roof is formed by a plurality of gas cushions through split joint, each gas cushion can be disassembled according to the requirement, and the top roof can be easily opened according to the selection during equipment lifting and loading; during the transportation, each wall is arranged in a special cloth bag, and the inflating pump is arranged in a wooden box, so the effects of convenience and difficult damage are realized; and when not in use, the dismountable dust-proof chamber has small size and small occupied area after the gas is released.