A nail box assembly for an anastomat, comprising a nail box front end assembly (100) and a nail box rear end assembly (300) which are connected by means of a bending executing mechanism (200). The nail box rear end assembly (300) comprises a housing and a pull rod (304) provided in the housing, a push broach blade (303), and a safety structure； the front end of the push broach blade (303) is connected to a cutting knife (101) of the nail box front end assembly (100)； the front end of the pull rod (304) is connected to the bending executing mechanism (200)； an inner cavity of the housing provides an activity space for forward and backward movements of the push broach blade (303) and the safety structure； the push broach blade (303) is located at an upper portion of the inner cavity of the housing； the safety structure comprises a connecting seat (305) and an executive element； the rear of the push broach blade (303) is connected to the connecting seat (305)； the executive element is located at a lower portion of the inner cavity of the housing； the push broach blade (303) is connected to the cutting knife (101) by passing through an upper portion of the bending executing mechanism (200). The push broach blade (303) is narrowed with respect to an existing structure, and occupies a smaller part of space of the housing, so as to facilitate the arrangement of the safety structure in the housing； moreover, after the width of the push broach blade (303) is narrowed, the resistance required to be overcome during bending is reduced, and the housing is bent at a larger angle under the same operating force.L'invention concerne un ensemble boîte pour clous destiné à un dispositif d'anastomose, comprenant un ensemble d'extrémité avant de boîte pour clous (100) et un ensemble d'extrémité arrière de boîte pour clous (300) qui sont reliés au moyen d'un mécanisme d'exécution de pliage (200). L'ensemble d'extrémité arrière de boîte pour clous (300) comprend un boîtier et une tige de
