The present application relates to disposable safety syringes, and more particularly, to disposable syringes capable of encapsulating injection needles in barrels after injection. A tip head to which the injection needle is coupled, a tip fastening groove positioned around an outer portion of the tip body integrally connected to the tip head, an O-ring groove positioned below the tip fastening groove and extrapolated by a tip rubber ring around the tip body outer portion, the A needle tip including a tip rubber ring extrapolated to an O-ring groove, and a needle tip connection groove positioned at a lower end of the tip body as an opposite side of the tip head； A neck portion for supporting the tip body of the needle tip and forming the edge of the development opening portion, a rear opening located on the opposite side of the development opening portion, a grip portion to which a finger is mounted upon injection to the outside of the rear opening, the development opening portion and the syringe A tip fastening protrusion which is located on the inner side of the barrel and is fastened to the tip fastening groove of the needle tip, the plunger stopper which is located on the inner side of the syringe barrel while being on the deployment port side and controls the entry of the plunger, and the rear opening side A barrel portion disposed on an inner side of the syringe barrel and including a separating protrusion for enclosing the needle tip in the barrel after injection； A plunger slides the inner surface of the barrel, and includes a plunger located around the outer portion of the plunger head for supporting a plunger detachment protrusion and a plunger detachment protrusion detachable from the needle tip connecting groove of the needle tip to the plunger head portion. Part: A disposable safety syringe can be provided that includes: a. Produced by the present application to prevent the infection by the injection needle after the use of the disposable syringe, to pro
