A mounting device includes a mounting box, a tray, and a sliding mechanism. The mounting box includes a bottom plate. The sliding mechanism includes a handle and at least one driving member. The driving member is movably coupled to the handle. In a pull configuration of the sliding mechanism, when the handle is rotated toward the bottom plate, the driving member is driven to drive the tray to move along a first direction, and when the handle is rotated away from the bottom plate, the tray is not driven to move. In a push configuration of the sliding mechanism, when the handle is rotated toward the bottom plate, the tray is not driven to move, and when the handle is rotated away from the bottom plate, the driving member is driven to drive the tray to move toward a second direction opposite to the first direction.