Abstract: The paper is to analyze the technology status of leak detection used in SF₆ electric equipment power system. Aiming at the infrared detection of SF₆ gas leakage in electrical equipment, the principle and method of infrared detection technology are introduced. According to the field test results, it can be concluded that the infrared imaging method can quickly and accurately find out the leakage point of SF₆ electrical equipment, which is worthy of popularization and application in electric power system.