Cooling apparatus of plasma lighting system

Disclosed is a cooling apparatus of a plasma lighting system comprising: a power supply for supplying a power source; a magnetron for generating electromagnetic wave by the power source from the power supply; a bulb for generating light in accordance with that inert gas is ionized by the electromagnetic wave; and a case unit of a hermetic shape including the magnetron and the power supply therein for cooling heat generated from the magnetron. The plasma lighting system prevents heat of high temperature generated from the magnetron from being transmitted and foreign substance from being introduced.