The invention discloses a safety syringe with a retractable needle tip, which includes a barrel (1), a needle seat (2) mounted in a mounting hole (11) at the head part of the barrel (1), and a core rod (3) with a snap-fit structure, wherein a stop shoulder structure is arranged at the upper part on the outer side of the needle seat (2) and the upper side wall of the mounting hole (11) of the barrel (1), and the barrel (1) and the needle seat (2) are positioned by means of the stop shoulder structure； a self-destruction blocking bar (5) for positioning and stopping the needle seat (2) is mounted at the bottom of the needle seat (2)； and the head part of the core rod (3) is in snap-fit connection with the top end of the self-destruction blocking bar (5). The invention relates to a disposable safety syringe with retractable needle tip, of which, the needle seat and barrel position precisely, the syringe seat provides strong and stable injection support force, the needle seat pulls backward easily, and the locking structure of the barrel and the core rod locks effectively, and thus fundamentally overcomes difficulty in assembly of the needle seat and the barrel and prevents the core rod from being pulled out of or re-pushed into the cavity of the barrel.
