A supporting device for holding a display module is disclosed. The supporting device comprises a main board, a first spacer layer, a first board and a sliding board. The main board extends along a first axis, and the first spacer layer overlaps on the main board. The first board is disposed on the first spacer layer so that a first sliding groove is formed by the main board, the first spacer layer and the first board. The sliding board is partially received in the first sliding groove so as to contact with at least one of the main board, the first spacer layer and the first board. When an external force is applied to the sliding panel, a first sliding block is rubbed against at least one of the main board, the first spacer layer and the first board so that the sliding panel is able to move along the first axis with respect to the main board between a highest position and a lowest position.