Abstract: This invention pertains to a device for the automatic installation of aerial beacons on a cable. The device has magazines for the distribution of half-beacons (12a, 12b) and means (16) for putting into place and assembly on the cable of half-beacons (14) respectively distributed by the magazines in order to form the beacons. Accordingly to the invention, the device incorporates attachment means (20, 22) for suspending on the cable (18) and for moving along a cable in a movement direction (X), the means (16) for putting into place and assembly being placed on the device so as to install the beacons behind the attachment means with respect to the movement direction.