The utility model relates to a sulfur hexafluoride mends gas shift piecing devices fast, its characteristics are: including quick -operation joint, this quick -operation joint's both ends lead to air through tube respectively and connect the intercommunication with air supply and the tonifying qi of treating tonifying qi equipment, and this quick -operation joint is by male joint (4), female joint (2) and retaining member (6) are constituteed, wherein male joint (4) are hollow tubulose, and it detains (5) and is equipped with the type of falling T platform on its top to be equipped with the horse tooth in this male joint (4) bottom outside, wherein female joint (2) are hollow tubulose, and it detains (5) and is equipped with T type platform in its bottom to be equipped with the horse tooth in this female joint (2) top outside, it has a slot to open in the middle of this T type platform, wherein retaining member (6) are including two semicircle rings. Adopt the utility model discloses a device back can realize that it connects not need to change the tonifying qi when on -the -spot tonifying qi again to shorten tonifying qi time of preparation greatly, reduce work load, improve the security.