Double-film gas holder with airtightness detection device

The utility model discloses a double-film gas holder with an air tightness detection device, which comprises a fixing frame, a gas film is arranged above the fixing frame, a rotating rod is arranged in the middle of the gas film, a hydraulic rod is arranged above the rotating rod, a knob is arranged above the hydraulic rod, a first fixing block is arranged in front of the fixing frame, a sliding chute is arranged in the first fixing block, and a second fixing block is arranged in the sliding chute. A spring and a sliding block are arranged in a sliding groove, a second fixing block is arranged on the left side of the sliding block, a first hydraulic rod stretches out and draws back to drive a check block to move downwards, an air film is shrunk, the second sliding block is pushed to move rightwards, then a first sliding block is driven to move rightwards, the first sliding block leaves a second clamping groove, a straight rod is rotated to drive the hydraulic rod to rotate, the hydraulic rod is attached to a