The invention relates to a spiral nozzle, a spiral air spraying device and a spiral air spraying method. The spiral nozzle comprises a nozzle body and an adjustable spiral spray hole arranged along the circumferential direction of the outer wall of the nozzle body. The spiral air spraying device comprises the spiral nozzle, an air spraying hole connected with an air spraying outlet of the spiral nozzle and an air inlet chamber, wherein the air inlet chamber is communicated with an inner cavity formed by the spiral nozzle, the spiral nozzle is used for spraying a gas medium with a fixed tangential kinetic energy in the air inelt chamber into the air spraying hole by virtue of the adjustable spiral spray hole in the spiral nozzle. The airflow with relatively high tangential kinetic energy can enter into the air spraying hole along the tangential direction with an adjustable angle under a relatively high pressure condition by virtue of the adjustable spiral spray hole, the tangential kinetic energy of high-speed tangential internal-rotation airflow is greatly improved by virtue of tangential flowing of the airflow, and the scavenging activity of the high-speed air and the contact area of steel surfaces are improved, so that the machinery water and the crystal water separated at a high temperature on the steel surfaces are effectively removed.