Abstract:This paper introduces the cause and harm of lightning stroke of power supply lines and the working principle of lightning protection device. Combined with the practical application of the mine, several common and effective lightning protection measures of power supply lines are emphatically introduced. The correct use of lightning protection measures can avoid the failure of power supply lines which were struck by lightning. It can protect the important industrial buildings and equipment and the mine safe production. And it can be used for reference for lightning protection of power supply lines in other mines.