Disclosed is a device having a piston formed in a multistage structure so as to administer a liquid into a human body. The device having a piston formed in a multistage structure so as to administer a liquid into a human body may comprise: a body having a liquid containing space formed therein, the rear end portion of the body being open, the body being configured in a streamlined or cylindrical shape, and the body having a liquid spraying opening formed in the front end portion so as to spray the liquid contained in the liquid containing space to the outside a support portion having an inner penetration opening formed therein, one side of the support portion being connected to the rear end portion of the body and a piston comprising a pressing member connected to the other side of the support portion and configured in a multistage structure such that, as a pressing table formed on the rear end portion of the pressing member is pressed, the pressing member successively moves forward and is contained inside the support portion, and a piston body inserted into the open rear end portion of the body as the pressing member successively moves forward such that, when moving forward, the piston body sprays the liquid contained in the liquid containing space to the outside through the liquid spraying opening, the backward movement of the piston body being limited.Linvention porte sur un dispositif ayant un piston formé dans une structure à étages multiples de façon à administrer un liquide dans un corps humain. Le dispositif ayant un piston formé dans une structure à étages multiples de façon à administrer un liquide dans un corps humain peut comprendre: un corps ayant un espace contenant un liquide formé dans celui-ci, la partie dextrémité arrière du corps étant ouverte, le corps étant configuré en une forme profilée ou cylindrique et ayant une ouverture de pulvérisation de liquide formée dans la partie dextrémité avant de manière à pulvériser le liquide contenu dans lespac
