An injection device is provided for repairing biological tissues and comprises a body (10), a chamber (30), an exterior tube (40), and a screw rod (60). The chamber is connected with the body and used for accommodating a repairing material. The exterior tube is connected with the chamber. The screw rod is disposed inside the chamber and the exterior tube. The threads of the screw rod disperse the repairing material. By using the threads of the screw rod and a driving force originating from the end of the screw rod, the repairing material is delivered into an organism.
