Abstract: A hair curler comprises a handle, a roller and a heating part. One end of the roller is fixedly connected to the handle and the heating part is electrically connected to the power source. The hair curler comprises a heat insulation unit which is fixedly disposed on the other end of the roller away from the handle and closes the other end of the roller; an extending part is disposed on the other end of the roller; the heat insulation unit comprises a heat insulation part, an end cap and a fixing member, the end cap is cap joint to the other end of the roller, the heat insulation part is adapted inside the extending part and located between the end cap and the heating part, and the fixing member fixes the end cap with respect to the roller; and the heat insulation part is made of heat insulation materials.