Disclosed is a syringe for injecting a surgical thread. The syringe includes a needle part, a connection part and an injection part. The needle part is adapted to penetrate the skin while accommodating a surgical thread. The connection part is connected to the needle part by taper coupling and is fixedly fastened to the needle part by turning operation of the needle part. The injection part is coupled to the connection part at the front end thereof. A push needle installed in the injection part pushes the surgical thread accommodated in the needle part to inject the surgical thread into a skin tissue in a syringe operation manner.