The present invention relates to a filter assembly for a syringe, wherein the filter assembly is coupled with a needle part of the syringe. The filter assembly according to the present invention comprises a first blocking film, a filter, a filter plate, a case, and a second blocking film. The first blocking film contains an elastic material and has a shape of a cone hat or a flat plate. The edge of the first blocking film is downwardly shrinkable by the pressure at which a liquid chemical is sucked. The filter has a circular plate, and is spaced apart from the bottom side of the first blocking film. The filter filters foreign materials from the liquid chemical which is sucked due to the shrinkage of the edge of the first blocking film. The filter plate has a circular shape, and is disposed on the bottom surface of the filter. The filter plate has a plurality of suction holes for facilitating the suction of the liquid chemical passing through the filter. The case has a circular shape, and has a ring-shaped ejection hole formed along the edge. The case is inserted internally from the bottom side of the needle part while wrapping outer peripheries of the first blocking film, the filer, and the filter plate. The second blocking film is used for opening or closing the ejection hole of the case. The second blocking film contains a silicon material, and mounted on the ejection hole. The second blocking film is opened or closed in upper and lower directions along an inside of the case. According to the present invention, the filter assembly for a syringe is provided at the needle part to filter foreign materials such as glass, fragments, and rubber pieces, thereby ejecting a liquid chemical without foreign materials from the syringe. In addition, the liquid chemical passes through the filter when being sucked into the syringe, thereby giving a direct injection to a patient who can get a direct injection or injecting the liquid chemical to a patient who is injected with Ring
