Self destruction safety injector

The utility model discloses a self-destruction safety injector which belongs to the technology of medical appliances. The utility model is mainly characterized in that head end of a core rod (1) is provided with an elastic clamping claw (1-2-2), the head end of an outer sleeve (2) is provided with a needle seat (4), and the elastic clamping claw (1-2-2) is buckled with the needle seat (4) which can be pulled and retracted to enter the outer sleeve (2) when the core rod (1) is retracted. The utility model has the characteristics of reasonable structure, convenient use and operation, simple preparing process, etc., and has the double effects of self destruction and safety. The utility model is an ideal injector which can fully avoid clinical cross infection.