Supporting plate mechanism capable of opening or closing by rotation

The utility model discloses a supporting plate mechanism capable of opening or closing by rotation. The mechanism consists of a supporting plate, a fixed panel and a connecting device and is characterized in that the fixed panel is provided with a magnet used for attracting the supporting plate; two sides of the supporting plate mechanism are provided with limiting devices; and the supporting device and the fixed panel are connected through a damping hinge. The mechanism provides a temporary platform for objects to be put on during the operation and maintenance of electronic equipment and brings great convenience to operating staff. The mechanism has the advantages of simple structure, using convenience and space saving.