Disclosed is a stent delivery system (100), comprising an outer cannula component (1), an inner cannula component (2) and a clamping ring (3). The outer cannula component (1) comprises an outer cannula body (11) and an outer cannula tip (13) connected to the front end of the outer cannula body (11)； the outer diameter of the outer cannula tip (13) is stepwise reduced from back to front. The inner cannula component (2) comprises a pushing tube (21) sleeved inside the outer cannula component (1), a stent placement tube (23) connected to the front end of the pushing tube (21), and an inner cannula tip (24) arranged at the front end of the stent placement tube (23)； the outer diameter of the pushing tube (21) is greater than that of the stent placement tube (23)； the outer cannula tip (13) is arranged at the front end of the outer cannula body (11)； the outer diameter of the outer cannula tip (13) is stepwise reduced from back to front such that the outer cannula tip (13) matches a stent accommodating tube of an assisted stent introducing device, enabling the stent to be quickly and conveniently transferred to the stent placement tube (23) from the stent accommodating tube and resulting in convenient use. Besides, a gap between the pushing tube (21) and the outer cannula body (11) is reduced, therefore increasing the pushing force of the pushing tube (21) and bringing along high practical value.L'invention concerne un système de pose d'endoprothèse (100) comprenant un composant de canule externe (1), un composant de canule interne (2) et un anneau de serrage (3). Le composant de canule externe (1) comprend un corps de canule externe (11) et une pointe de canule externe (13) reliée à l'extrémité avant du corps de canule externe (11) ； le diamètre externe de la pointe de canule externe (13) diminue progressivement de l'arrière vers l'avant. Le composant de canule interne (2) comprend un tube de poussée (21) chemisé à l'intérieur du composant de canule externe (1), un tube
