The present invention relates to a quick connector, which has a special structure for preventing unintended connector detachment. The quick connector at least comprises a first main body, a second main body and a lock unit, wherein the lock unit is sleevedly mounted on one end of the first main body and blocked by an oil seal, the second main body is adjacent to the first main body to enable the lock unit to cover the second main body, and the lock block inside the lock unit is embedded into the lock groove of the second main body, thus to accomplish the link relation of the first body, the second body and the lock unit. The special anti-detachment design of the present invention can effectively prevent unintended detachment so as to ensure the connector to remain constantly connected.本發明係為一種快速接頭,又該快速接頭具有防止非預期脫離之特殊結構。該快速接頭至少包括有第一本體、第二本體與鎖合體;其中,該鎖合體經套置於第一本體一端且被一油封擋制,經將第二本體靠接於第一本體,令鎖合體外覆於第二本體,且鎖合體內部之鎖合塊嵌入第二本體之鎖合槽內,即能完成第一本體、第二本體與鎖合體之連結關係;本案更特別是該鎖合槽具有特殊防脫設計,能有效避免非預期之脫離,能確保接頭恆處於連結關係。1...第一本體11...壓合部12...通道13...第一接合口14...第二接合口15...環槽151...油封16...第二鎖合槽17...油封2...鎖合體20...空間21...鎖合塊3...內套管30...空間31...擋環4...第二本體40...開口41...凹環42...油封43...內縮體44...鎖合槽441...通道442...擋塊443...容置口444...斜導角445...直角5...第二鎖合體50...空間51...第二鎖合塊52...封合面521...穿孔