The invention discloses a plasma gun ignition blow-on method of a boiling chlorination furnace. High energy plasma generated by a plasma gun is taken as start energy for ignition and heating; compressed air is taken as the combustion improver; a boiling chlorination reaction raw material bed is gradually heated and ignited in a sectional type; after ignition and heating, the control system of a chlorination reactor is started, and the ignition-heating and device starting-running are seamlessly jointed. The technology is characterized in that (1) high energy plasma generated by a plasma gun istaken as the start energy for the ignition and heating of a boiling chlorination furnace, and the plasma is simple and is easy to control; (2) the raw materials are used to build a bed; other fuels such as coal, oil, gas, and the like, are not needed; the burning does not generated any smoke, and the technology is clean and environmentally friendly; (3) petroleum coke of the raw materials for building the bed is burned by the plasma flame, fine petroleum coke is burned at first, then coarse petroleum coke is burned, the burning is fast, the temperature is easy to control, energy is saved, andthe efficiency is high; and (4) ignition-heating and device starting-running are seamlessly jointed, and the production efficiency is high.