The utility model relates to a SF6 equipment gas -charging connection is instrument of locking fast, including two circlets, a plurality of quick detach check lock levers that are used for connecting two circlets, the nut, the circlet encircles A by the semicircle, semicircle ring B is articulated to be constituted, semicircle ring A lower extreme is provided with the slot, semicircle ring A upper end is provided with the portion of stepping down, the portion of stepping down is provided with spacing fender groove, semicircle ring B lower extreme is provided with the grafting portion that matches with the slot, be provided with the matched with pinhole on grafting portion and the slot, be provided with the round pin axle in the pinhole, semicircle ring B upper end sets up the mounting groove, in the mounting groove articulated have with spacing fender groove matched with gag lever post, semicircle ring A, the pole portion of gag lever post stretched into spacing fender inslot when semicircle ring B was closed, semicircle ring A, semicircle ring B goes up the circumference equipartition has a plurality of through -holes that the quick detach check lock lever passed that do benefit to, the utility model discloses simple structure, reasonable in design, installation disassembling operation is swiftly convenient, weak point consuming time, safe and reliable has improved the security of work efficiency with job site.