An elastic hair clip includes a clip frame composed of a first clip frame and a second clip frame, and a joint member. The first and the second clip frame respectively have one end integrally forming a joined end and another end forming an open end, respectively. A clipping strip is disposed between the first and the second clip frame, a little shorter than the first and the second clip frame and having one end formed integrally with the joined end of the first and the second clip frame. When the hair clip is used, the open ends of the first and the second clip frame are combined together by the joint member to make the first and the second clip frame properly curved for clipping hair with the help of the clipping strip.