The invention discloses a high-strength sealed gas storage cabinet system of a double-inflation-film structure. The system comprises a biogas digester located underground and a marsh gas chamber located above the ground. A shell of the marsh gas chamber is of a double-layer structure and comprises an outer-layer film and an inner-layer film, an insulation and pressure regulating chamber serving as an insulation layer and a pressure regulating cavity is arranged between the outer-layer film and the inner-layer film, an air inlet is formed in the insulation and pressure regulating chamber and connected with an air blower at the outer portion of the marsh gas chamber, and a pressure controller is arranged in the insulation and pressure regulating chamber and connected with the air blower in a control manner. A steel wire protective net is arranged on the outer layer of the outer-layer film and comprises an upper annular weft net, a middle annular weft net and a lower annular weft net. The upper annular weft net and the middle annular weft net are movably connected through connecting steel bars and the middle annular weft net and the lower annular weft net are movably connected through connecting steel bars.