The utility model relates to a high -tension apparatus and gas -insulated technical field refer in particular to a SF6 and gaseous flash mixed device of N2, including the protection casing, protection casing both ends are equipped with the connecting element respectively, and protection shells inner wall goes up fixed being equipped with and stops groove and support, is equipped with the rotating element on the support, and protection casing one end is connected on the gas circuit system is inflated to the mist, and the protection casing other end is connected on gas -insulated equipment. This device direct mount does not change the mist and aerifys gas circuit system architecture and function, more safe and reliable on the gas circuit system is aerifyd to the mist, this device has simple and clear, nimble, practical characteristics, utilize this device carry on the mist aerify that the gas -insulated equipment of can realizing need not to stew can direct test or application, higher practical engineering value has.