The present invention relates to a disposable safety syringe in which a plunger is moved forward after injection to be coupled to an injection needle and is then moved backward to isolate the injection needle within a cylinder, and even if the plunger is moved forward before the injection, the plunger is not coupled to the injection needle and thereby, the disposable safety syringe can be normally used. The disposable safety syringe of the present invention comprises: a cylinder (110) a coupling tube (111) protruding from the front end of the cylinder a plunger (120) inserted into the cylinder so as to be movable back and forth an injection needle fixing tube (130) coupled to the coupling tube an adapter tube (140) which is inserted into the injection needle fixing tube so as to be movable back and forth and which pulls the injection needle fixing tube into the cylinder by being coupled to the injection needle fixing tube while moving backward an elastic latching part (150) protruding from the front end of the plunger and coupled to the adapter tube when the plunger is moved forward and a resilient ring (160) provided on the elastic latching part to restrict the forward movement of the plunger during compression and to allow the forward movement of the plunger by being stretched while the plunger moves backward.La présente invention concerne une seringue de sécurité jetable dans laquelle un piston est déplacé vers lavant après injection pour être accouplé à une aiguille dinjection et est ensuite déplacé vers larrière pour isoler laiguille dinjection à lintérieur dun cylindre, et même si le piston est déplacé vers lavant avant injection, le piston nest pas accouplé à laiguille dinjection et, de ce fait, la seringue de sécurité jetable peut être utilisée normalement. La seringue de sécurité jetable de la présente invention comprend : un cylindre (110) un tube daccouplement (111) faisant saillie de lextrémité avant du cylindre un piston (120) inséré dans le cylindre de
