Spiral electrode structure, plasma generating device and air purifier

The invention relates to a spiral electrode structure, a plasma generating device and an air purifier, and the spiral electrode structure comprises an insulating support frame; the first external electrode is spirally wound on the insulating support frame and is suitable for being grounded; and the second outer electrode comprises an electrode main body and a discharge tip formed on the electrode main body, the second outer electrode spirally surrounds the outside of the insulating support frame and is separated from the first outer electrode, the screw pitch of the second outer electrode is equal to that of the first outer electrode, and the second outer electrode is suitable for being connected with a direct-current power supply. Due to the fact that the curvature radius of the discharge tip is small, the second outer electrode can generate corona discharge under low voltage, initial electrons generated by the corona discharge can serve as excitation electrons for glow power generation, and the excitation e