The present invention relates to a disposable syringe having a safety filter function. A feeding guide piece having a filter insertion unit having a cutting line formed in the sealed bottom surface by being downwardly extended at a predetermined length from the circumference of a connection hole penetrated in the center thereof, and a filter is inserted in and fixed to the filter insertion unit. Then, the filter insertion unit of the feeding guide piece in which the filter is inserted and fixed is fixed and installed on a discharge guiding groove of an entrance valve. An injection liquid filtering pathway is maximized from the top end to the bottom end of the filter, so filtering can be actively performed. The filter is installed and fixed on the inner bottom surface of a cylinder and the inner top end part of a neck disposed in the bottom end of the cylinder. The filter is installed not to protrude to the inside of the cylinder from the inner top end of the neck. According to the structure of the filter which does not protrude to the inside of the cylinder, a gap between the bottom part of the cylinder and the bottom surface part of a packing unit of a plunger is minimized when the plunger is pressed, so a remaining amount existing of an injection liquid existing in the cylinder can be extremely minimized when the injection liquid is fed to a patient. A safety filter unit in which the filter is inserted and fixed is applied to the discharge guiding groove of the entrance valve and the connection hole of the feeding guide piece, so the discharge guide groove is penetrated corresponding to the filter and pressure of the plunger is minimized when an injection liquid is fed. Accordingly, an injection liquid is actively fed, and the plunger can be flexibly operated. Compared to conventional times, a safety accident with respect to distortion of a syringe needle inserted in the body of a patient can be prevented.COPYRIGHT KIPO 2016본 발명은 안전필터 기능을 갖는 일회용 주사기에 관한 것으로, 본 발명은
