The air shower is a supporting device for the clean workshops and the assembly clean room, is used to blow the dusts attached to the surfaces of the people and objects entering the clean workshop, and also functions as an air brake to prevent non-purified air from entering the clean area. It is an effective device to clean up the surfaces of the persons and the objects and to prevent the outdoor air from invading the clean area. It has strong versatility, can be used along with all clean rooms and clean workshops, and is an ideal choice to establish a dust-free workshop.