Plastic bottle air leakage detection device

The utility model discloses a gas leakage detection device for a plastic bottle, and the device comprises a detection box, a group of telescoping semi-ring assemblies which are disposed in the detection box in a manner that the telescoping semi-ring assemblies can get close to each other or get away from each other in the radial direction, and a driving structure which is disposed below the detection box and is used for driving the detection box to rotate. The sealing inflation structure is arranged above the detection box; one set of telescopic semi-ring assemblies can be matched to define an annular clamping ring used for clamping a plastic bottle. The sealing inflation structure comprises a sealing cover capable of being close to or away from the annular clamping ring from top to bottom, an inflation pipe penetrating through the sealing cover and an inflation mechanism communicating with the inflation pipe. The effects that mechanical detection is mainly adopted, and the overall operation efficiency is imp