The invention discloses a plasma ignition system which comprises a plasma ignition device, a plasma flame detection cooling fan and a boiler flame detection cooling fan, wherein the plasma ignition device comprises an ignition burner, a plasma generation device and a plasma flame detection probe; the plasma generation device and the plasma flame detection probe are arranged corresponding to the ignition burner; the input end of the plasma flame detection cooling fan is in communication connection with the plasma ignition device; the plasma flame detection cooling fan blows wind towards the plasma generation device; when the plasma ignition device and the plasma generation device are started up, the plasma flame detection cooling fan is triggered to start working and to supply plasma carrier wind; when the plasma generation device is shut down, the plasma flame detection cooling fan is controlled to stop working; and the boiler flame detection cooling fan is kept in a normally open state and blows wind towards the plasma flame detection probe. According to the plasma ignition system disclosed by the invention, the plasma flame detection cooling fan and the plasma ignition device are started up and shut down in a linked manner, thereby reducing the equipment operation, lowering the energy consumption, and reducing the maintenance.