An electrohydraulic microjet drug delivery device, comprising: a discharge body provided with a power supply unit in which electric energy is stored; and a medicinal fluid delivery body detachably attached to the discharge body, the medicinal fluid delivery body including a pressure generation unit configured to store a pressure generation liquid, a medicinal fluid storage unit configured to store a medicinal fluid, an elastic separation membrane installed between the pressure generation unit and the medicinal fluid storage unit and configured to separate the pressure generation liquid and the medicinal fluid, a discharger installed inside the pressure generation unit so as to be submerged in the pressure generation liquid and configured to generate a spark using the electric energy stored in the power supply unit, and a nozzle kept in communication with the medicinal fluid storage unit, wherein when the spark is generated in the discharger, a part of the pressure generation liquid is vaporized and expanded to deform the elastic separation membrane toward the medicinal fluid storage unit so that the medicinal fluid is injected through the nozzle, characterized in that the device further comprises: a first terminal installed on the discharge body and connected to the power supply unit; and a second terminal installed on the medicinal fluid delivery body and connected to the discharger, wherein when the discharge body and the medicinal fluid delivery body are coupled, the first terminal and the second terminal come into contact with each other so that the electric energy stored in the power supply unit is transferred to the discharger. a discharge body provided with a power supply unit in which electric energy is stored; and a medicinal fluid delivery body detachably attached to the discharge body, the medicinal fluid delivery body including a pressure generation unit configured to store a pressure generation liquid, a medicinal fluid storage unit configured to store a medicinal fluid, an elastic separation membrane installed between the pressure generation unit and the medicinal fluid storage unit and configured to separate the pressure generation liquid and the medicinal fluid, a discharger installed inside the pressure generation unit so as to be submerged in the pressure generation liquid and configured to generate a spark using the electric energy stored in the power supply unit, and a nozzle kept in communication with the medicinal fluid storage unit, wherein when the spark is generated in the discharger, a part of the pressure generation liquid is vaporized and expanded to deform the elastic separation membrane toward the medicinal fluid storage unit so that the medicinal fluid is injected through the nozzle, a first terminal installed on the discharge body and connected to the power supply unit; and a second terminal installed on the medicinal fluid delivery body and connected to the discharger, wherein when the discharge body and the medicinal fluid delivery body are coupled, the first terminal and the second terminal come into contact with each other so that the electric energy stored in the power supply unit is transferred to the discharger.