Spiral electrode, plasma generating device and air purifier

The invention relates to the technical field of air purification, in particular to a spiral electrode, a plasma generating device and an air purifier, in the air inlet direction of the air purifier, the spiral electrode is provided with a windward side and a leeward side, and the spiral electrode comprises an inner electrode, an outer electrode and an inner electrode, the outer electrode is spirally wound outside the medium tube; and the barrier structure comprises an insulating part arranged on the leeward side of the spiral electrode, and the insulating part at least covers part of the outer electrode so as to reduce discharge of the outer electrode on the leeward side. According to the spiral electrode, by arranging the blocking structure, the insulating part of the blocking structure can cover at least part of the outer electrode on the leeward side, so that discharge of the outer electrode on the leeward side of the spiral electrode can be effectively reduced, and the problem that excessive idle work is