Abstract: An air ventilation safety helmet includes a molded helmet and an air funnel which can be attached to the molded helmet by using a rubber band, a spring, a screw, or the like. In the front of the air funnel, there is an air inlet through which the air can flow into the helmet. Inside the liner of the molded helmet, there are several air ducts directed to the air funnel so that the air can flow through the air ducts to provide good air ventilation. When it rains or it is cold, the air funnel can be rotated to prevent the cold air from flowing into the helmet and to avoid water leakage.