The invention relates to a multipurpose air dryer and an application method thereof, which are designed in order to solve the technical problems that the function and the application of the traditional air dryer are single because the air dryer body is fixed and the structure of the air dryer is poor. The multipurpose air dryer has the main points that the body of the air dryer is fixed on a bracket; the bracket is sleeved into a support; the body of the air dryer is driven by the bracket to make vertical fan-shaped rotation on the bracket; and the body of the air dryer vertically moves up and down in the support. The application method of the multipurpose air dryer has the main points that the vertical fan-shaped rotation of a support rotation rack is realized by a semi-angle gear structure; one arc of an external semi-angle gear and one arc of an internal semi-angle gear are gear sections, and the other arcs thereof are arc sections; the gear section of the external semi-angle gear and the gear section of the internal semi-angle gear are engaged; and a hack lever piece is limited by a rod connecting piece when the support vertically moves up and down. The bracket and the support of the air dryer have good compatibility with the traditional air dryer; therefore, the multipurpose air dryer is suitable for air drying of all parts of a human body and all articles in places, such as household toilets, hotel toilets, beauty salons and the like and the improvements of similar air dryers.