With the development of automobile gasoline engine to the direction of high speed, high compression ratio, high power, low fuel consumption and low emission, the traditional ignition device has been unable to meet the requirements of use. The core components of the ignition device are the ignition coil and the switching device, improve the energy of the ignition coil, the spark plug can produce enough energy spark, which is the basic condition of the ignition device to adapt to the operation of modern engines.