Abstract: Automatic watches use the movements of the wrist to re-wind the barrel spring and thus supply the necessary energy for the correct functioning of the watch. When the user cannot wear the watch it is proposed to place it on an automatic re-winding device. The device according to the invention is compact and modular. Furthermore, in order to avoid any error of manipulation, the starting and stopping of the re-winding device is done automatically by means of a detection of the presence of the watch (3). The passing of the strap in the detachable base (2) produces the tension of the device.