Arrangement of a circumferential joint of structural elements with a coupling element manufactured in composite material in a aeronautic structure, which comprises: two sections (13, 15) of skin (11) manufactured in a composite material with an external surface (17) and an internal surface (19); an internal structural element (41); a plurality of rivet rows (12) and a coupling element (21) to facilitate the joint of adjoining skin (11) sections (13, 15), with an external surface (23) and an internal surface (25), manufactured in composite material in a plurality of separate parts (27, 29), with the ends of each pair of adjoining parts (27, 29) being formed in a wedge shape, with one of them pointing to the skin (11) and the other to the internal structural element (41) and with their inclined faces overlapping (31,33).