A safe insulin pen needle for injecting insulin, comprising a needle hub (10), a needle head protector (20), and a hub sleeve (30). The hub sleeve (30) is provided with a first elastic jaw (31) matching a first initial fixing position (22) on the outer wall of the needle head protector (20)； the provision of a non-return flange (23) at the side of the first initial fixing position (22) matching the first elastic jaw (31) effectively avoids the risk of needle head protection failure resulting from that some users rotate an insulin pen in a needle removal process. A needle tube (11) in the needle hub (10) comprises a needle head (111) and a needle end (112)； the provision of a needle end protection structure at the needle end (112) effectively avoids the safety risk that the needle end (112) is prone to hurt the user. The needle end protection structure comprises a protection sleeve (40) and a needle end protector (50)； the protection sleeve (40) is provided with a second elastic jaw (41)； the outer wall of the needle end protector (50) is provided with a second initial fixing position (51) matching the second elastic jaw (41)； the provision of a second non-return flange (52) at one side of the second initial fixing position (51) effectively avoids the risk of needle end protection failure resulting from that the needle end protector (50) may be driven to rotate in a separation process of the insulin pen and the insulin pen needle.L'invention concerne une aiguille sûre de stylo à insuline pour l'injection d'insuline, comprenant un raccord d'aiguille (10), un protecteur de tête d'aiguille (20) et un manchon de raccord (30). Le manchon de raccord (30) est pourvu d'une première mâchoire élastique (31) correspondant à une première position de fixation initiale (22) sur la paroi externe du protecteur de tête d'aiguille (20)； la disposition d'une bride de non-retour (23) sur le côté de la première position de fixation initiale (22) correspondant à la première mâchoire élast
