The invention discloses a gas atomization spraying nozzle. The gas atomization spraying nozzle comprises a nozzle, an air joint, a liquid joint and a mixing cavity, wherein the mixing cavity is connected to the head surfaced of the nozzle; the air joint is arranged at the upper part of the mixing cavity; the liquid joint is positioned on the back surface of the mixing cavity; the external of the liquid joint is coated with a connecting nut; a thread joint is arranged on the air joint; the nozzle is a circular nozzle; the circular nozzle is provided with a filter screen in a spout; and the filter screen is a stainless steel dense screen. As the nozzle is the circular nozzle, the atomization speed of the nozzle can be largely accelerated, the atomization area can be increased, the water resource needed by the atomization is reduced, the water current overflow caused by overhigh water pressure is prevented, and the workshop ground dryness is kept; and the filter screen is arranged in the spout, so that impurities in running water can be filtered away to prevent the nozzle from being blocked to delay the workshop atomization operation, and the service life of the nozzle is prolonged.