Disclosed is a medical device for surgical operation. The medical device for surgical operation according to the present disclosure includes: a body unit configured to be gripped by an operator and having a supply pipe configured to supply fluid, a suction pipe configured to suck fluid, a regulation unit configured to regulate a flow rate of fluid, and a power connection unit configured to receive applied external power, each of which is installed in the body unit； a surgical treatment unit detachably coupled to the body unit, the surgical treatment unit including a hollow conductive adaptor connected to each of the power connection unit, the supply pipe, and the suction pipe and having an electrode tip protruding at an end thereof and an insertion pipe configured to perform a relative movement in a state of accommodating the adaptor therein and to selectively expose the electrode tip to the outside through the relative movement； and a treatment-switching unit provided in the body unit in a state of being connected to the power connection unit so as to selectively switch between surgical treatments performed by the electrode tip on the affected part. According to the present disclosure, a surgical treatment, such as incision, and a cleansing operation are both performed through the surgical treatment unit formed in a single thin tubular shape. In addition, the electrode tip, which performs a relative rotation with respect to a body unit, is selectively accommodated in the insertion pipe, and the surgical treatment, such as incision, hemostasis, or coagulation of an affected part, is performed easily and freely using the treatment-switching unit. Therefore, it is possible to perform minimally invasive surgery on the affected part in the body easily, rapidly, and precisely without fear of damage or injury to an internal body tissue or an electrical accident caused by the electrode tip.
