The invention discloses a safety self-destructive
syringe. The
syringe comprises a protective cap, a
syringe needle, a cylinder, a push rod and a
syringe needle protective device. The
syringe needle comprises a needle seat and a needle tip installed on the needle seat, the protective cap is fixedly arranged on the
syringe needle, the syringe needle is installed at the front end of the cylinder through the syringe needle protective device, the push rod with an o-shaped
piston is installed in a hollow cavity of the cylinder, and therefore the safety self-destruction syringe is formed. The syringe needle protective device comprises a 6:100 Ruhr
rotary union, a protective arm, a hinge and a buckle, wherein the 6:100 Ruhr
rotary union enables the syringe needle and the cylinder to be connected together, the syringe needle is contained in the protective arm, and the hinge and the buckle enables the syringe needle to be located. The hinge is connected between the outer circumferential surface of the upper end of the 6:100 Ruhr
rotary union and the bottom face, close to the lateral side, of the protective arm to enable the protective arm to rotate relative to the 6:100 Ruhr rotary union. The safety self-destructive syringe is simple in structure, easy to operate, capable of conducting protection and self-destruction on the polluted syringe needle after injection ends, and therefore the syringe needle is prevented from piercing people again and the syringe is prevented from being reused.