The present invention is related to a medical aspirator and, in particular, to a medical aspirator comprising: a floor plate a pressure plate disposed a certain distance away from the floor plate, and defining a discharge hole opened and closed by an opening/closing means a coil spring installed between the floor plate and the pressure plate a sealing membrane connecting the edges of the floor plate and the pressure plate, and defining a receiving space capable of receiving bodily fluid between the floor plate and the pressure plate and a drainage tube connected to the pressure plate, for guiding bodily fluid generated from the body to the receiving space, and including a check valve therein enabling the fluid to flow only in the direction from the body toward the receiving space, wherein the medical aspirator has the effect of preventing contamination from outside air of bodily fluid extracted from the body and stored in the receiving space.
