Abstract: A winding wheel set for a curtain comprises a base and a roller, wherein the roller is rotatablely disposed on the base, in the base is formed an elongated slot for insertion of a string, thus making the string be wound on the roller comfortably, so as to prevent the former problem that the string is hard to be pulled because of the big bend. Additionally, on the roller are disposed two blocks for cooperating with the roller, so as to limit the string to be wound on the start position of the roller.