Wind power air machine

A wind power ventilator comprises a base frame, a driving axis, meniscus-shaped fan paddles, an upper bearing and a lower bearing, and an upper connecting element and a lower connecting element. The two ends of the meniscus-shaped paddles have respectively a fixed connection with a top cover board and a bracket, thus forming a meniscus-shaped windmill positioned on the base frame. The top cover board is provided with a capping. The meniscus-shaped windmill is connected with the driving axis through the upper connecting element and the lower connecting element. The upper connecting element is positioned in the capping while the lower connecting element is connected with the bracket. The upper part of the driving axis is fixed with the upper connecting element through the upper bearing and the lower part is fixed with the lower connecting element through the lower bearing. Bracket stiffeners are positioned on the bracket. The bracket stiffeners form an inclined plane against the bracket and the inclination direction of each bracket stiffener is the same. The utility model is simply structured and conveniently processed and manufactured and not only has the capacity to exhaust wind but also has the ventilation capacity, thus carrying on a continuous process of wind exhausting and ventilation and guarantying the timely remove of the contaminated air in the room and preventing the environment pollution or supplementing fresh air according to the needs of the room.