A plug unit for a hybrid vehicle is provided. The plug unit includes a low voltage plug connected to or disconnected from a low voltage circuit formed by a low voltage battery and a low voltage component, and allows a current to flow between the low voltage battery and the low voltage component when the low voltage plug is connected to the circuit. A high voltage plug connected to or disconnected from a high voltage circuit formed by a high voltage battery and a high voltage component, and allows a current to flow between the high voltage battery and the high voltage component when the high voltage plug is coupled to the circuit. Further, a main base having the high voltage plug mounted thereon, allows current flow in the circuits when the base is mounted and obstructs the current flowing in the high voltage circuit when the base is demounted.