The present invention discloses a disposable safety syringe that has a needle hub having an accommodating space therein for various purposes. More specifically, the present invention provides a needle hub, configured to an end of a barrel, wherein the needle hub comprises an internal needle, an external needle and a hub body. The hub body has an accommodating space formed therein, the internal needle is configured at a proximal end of the hub body, the external needle is configured at a distal end of the hub body, the internal needle and the external needle are connected to the accommodating space for various purposes. Furthermore, the present application further provides a multi-stage protector for avoiding needle prick accidents.
