A medical syringe according to an embodiment of the present invention comprises: a syringe body unit having a syringe needle installed at the front end thereof, and having a body space formed therein a feeding pipe having a front end communicating with the syringe needle, and having a rear end disposed in the body space a bodily liquid removing unit having a bodily liquid storing space formed to store a bodily liquid, and inserted into the syringe body unit to make the rear end of feeding pipe disposed in the bodily liquid storing space and to make the bodily liquid storing space communicate with the body space and a treating agent feeding unit having a treating agent storing space for storing a treating agent, and inserted into the syringe body unit to make the feeding pipe communicate with the treating agent storing space. When the syringe needle is inserted into human body tissue, the bodily liquid removing unit is backwardly moved from the front end of the syringe body unit, and negative pressure generated in the body space is moved to the bodily liquid storing space. A bodily liquid is suctioned from human body tissue through the syringe needle and the feeding pipe to be stored in the bodily liquid storing space. After the bodily liquid removing unit is separated from the syringe body unit, the treating agent feeding unit is inserted into the syringe body unit to make the rear end of the feeding pipe communicate with the treating agent storing space, and the treating agent feeding unit is forwardly moved toward the front end of the syringe body unit. Then, a treating agent in the treating agent storing space is pressed, and the treating agent is preferably fed into human body tissue through the feeding pipe and the syringe needle.COPYRIGHT KIPO 2017본 발명의 일 실시예에 따른 의료용 주사기는, 전단에 주사바늘이 설치되고, 내부에 본체공간이 마련된 주사본체부 전단이 주사바늘에 연통되고, 후단이 본체공간에 위치된 주입관 체액이 저장되는 체액저장공간이 마련되며, 주입관의 후단이 체액저장공간에 위치되고 체액저장공간이 본체공간과 연통되게 주사본체부에 삽입된 체액제거부 및 치료제가 저장되는 치료제저장공간이 마련되고, 주입관이 치료제저장공간
