A hair barrette includes two barrette members each having an outer head engaging end and an ear extended from an inner coupling end, and a coupling device includes two coupling members disposed above and below the ears and having two pivot axles for pivotally coupling the ears between the coupling members and for allowing the barrette members to be folded to an opened working position where the barrette members are opened and oppositely spaced from each other for forming or operating as a hair barrette device, and to be folded relative to each other to a folded storing position where the barrette members are engaged with each other for forming or operating as a hair clip device.