Abstract: An automatically lockable cable rewinding structure includes an upper case having a first locating element; a lower case provided with a limiting recess; and a working member located between the two cases, and provided with a second locating element and a guide path for a rolling element to move therein. A length of cable is wound around the working member, and an elastic element is connected at two ends to the first and second locating elements. The limiting recess is formed at radially inner and outer ends with transverse inner and outer slits, respectively, and between the inner and the outer end with a longitudinal central slit, so that the rolling element is able to stably roll to and fro in the limiting recess along the central slit. Alternatively, the limiting recess and the guide path may be provided on the working member and the lower case, respectively.