The ignition device is equipped with solenoid valve and high-voltage unit, which is installed on the cutting torch to adjust the distance between the cutting nozzle and ignition source, When power is on, with the help of the solenoid valve the high-voltage unit will bring about fire source, which will meet with the fire hole of the cutting nozzle to realize ignition. Using the ignition device it makes it easier to work, and can improve effiency and reduce the inefficient combustion time if the cutting nozzle.