A multiple-function hanging and fastening device has multiple functions of an attracting magnet, a sucking sucker and a tightening screw, characterized in that, at least one side of the device has a magnet and a rubber sucker, for selective sucking on to a computer, electrical appliance, decorated wall surface, a metal panel of a car or a piece of furniture, a glass panel or a smooth plate, and selectively, a magnet and a rubber sucker are installed on a same side to increase its suction performance, and the outside or structural body of the casing is provided with a screw hole permitting the insertion of a screw to fasten onto an ordinary wall surface, and, one of accessories, including a hanging hook, a Velcro band, a wire bundling band and a multiple-function gripping palm figure, can be combined onto the main unit to extend its range of applications, obviously, its structure and applications have multiple functions and convenience.