An occluder (10), an occluder fastening system and a fastening method therefor. The occluder (10) comprises a first occluding portion (11) and a second occluding portion (15), the distal end of the first occluding portion (11) is provided with a connecting bolt (112) along the direction of the second occluding portion (15), a first external thread (113) is provided on a side wall of the connecting bolt (112), a protrusion portion (152) is provided at the proximal end of the second occluding portion (15), a through hole (153) is provided on the protrusion portion (152), a second external thread (154) is provided on a side wall of the protrusion portion (152), the thread direction of the first external thread (113) is opposite to the thread direction of the second external thread (154), and the proximal end of the connecting bolt (112) can pass through the through hole (153) and be screwed to a nut (689). The structure designed for the occluder (10) can achieve high-efficiency, stable and reliable fastening by means of the combination with a pushing device (60), thereby improving the service life and occlusion effect of the occluder (10), reducing the risk of postoperative complications, and being particularly applicable for occlusion treatment of rupture of aortic dissection.L'invention concerne un dispositif d'occlusion (10), un système de fixation de dispositif d'occlusion et un procédé de fixation associé. Le dispositif d'occlusion (10) comprend une première partie occlusion (11) et une seconde partie occlusion (15), l'extrémité distale de la première partie occlusion (11) est pourvue d'un boulon de raccordement (112) le long de la direction de la seconde partie occlusion (15), un premier filetage externe (113) est disposé sur une paroi latérale du boulon de raccordement (112), une partie saillie (152) est disposée au niveau de l'extrémité proximale de la seconde partie occlusion (15), un trou traversant (153) est disposé sur la partie saillie (152), un second fil
