The invention relates to the technical field of a medical device, in particular to a safe insulin pen needle for injecting insulin. The safe insulin pen needle having the above structure effectively circumvents the risk of the needle head protection failure caused by the rotation of the insulin pen during the needle pulling process by some users through a first check flange on one side of a first initial fixing position matched with a first elastic clamping jaw； effectively circumvents the safety risk that the needle tail tends to damage the user through the needle tail protection structure； at the same time, effectively circumvents the risk that the needle tail protector will rotate and thus the needle tail protection will fail during the separation of the insulin pen from the insulin pen needle through a second check flange on one side of a second initial fixing position matched with a second elastic clamping jaw.
