A foldable device, comprising: a chassis configured to support an electronic device or a small electric device; and a telescopic mechanism, wherein one end of the telescopic mechanism is assembled with the chassis and the other end of the telescopic mechanism is assembled with an electronic device or a small electric device; wherein the telescopic mechanism is telescoped to adjust a support height during use, and the telescopic mechanism is retractably received in the chassis during receiving; wherein the chassis is provided with a receiving groove, the telescopic mechanism is rotatably mounted in the receiving groove, and a locking mechanism is disposed between the telescopic mechanism and the receiving groove; the locking mechanism is configured to lock the telescopic mechanism with the chassis when the telescopic mechanism is used; and the locking mechanism releases a lock between the telescopic mechanism and the chassis when the telescopic mechanism needs to receive, and after unlocking, the telescopic mechanism is inverted with respect to the chassis and received in the receiving groove; characterized in that the telescopic mechanism comprises an inner sleeve that rotates the hinge end with the chassis, two sides of the hinge end of the inner sleeve respectively extend outward to form a rotating shaft, and two of the rotating shafts are disposed on the same axis; the locking mechanism comprises a fixing head, a fixing piece, an adjusting bolt, and an adjusting piece; wherein the rotating shaft is provided with an assembling cavity, the fixing head is fixedly fitted in the assembling cavity, and the fixing head is movable synchronously with the rotating shaft; one end of the fixing piece is fixedly mounted on the chassis; wherein the adjusting piece is disposed between the fixing piece and the fixing head, and/or between the fixing piece and the adjusting bolt; the adjusting bolt is threadedly fitted to the fixing head through the adjusting piece and the fixing piece for adjusting a frictional force between the fixing piece and the fixing head. a chassis configured to support an electronic device or a small electric device; and a telescopic mechanism, wherein one end of the telescopic mechanism is assembled with the chassis and the other end of the telescopic mechanism is assembled with an electronic device or a small electric device; wherein the telescopic mechanism is telescoped to adjust a support height during use, and the telescopic mechanism is retractably received in the chassis during receiving; wherein the chassis is provided with a receiving groove, the telescopic mechanism is rotatably mounted in the receiving groove, and a locking mechanism is disposed between the telescopic mechanism and the receiving groove; the locking mechanism is configured to lock the telescopic mechanism with the chassis when the telescopic mechanism is used; and the locking mechanism releases a lock between the telescopic mechanism and the chassis when the telescopic mechanism needs to receive, and after unlocking, the telescopic mechanism is inverted with respect to the chassis and received in the receiving groove; characterized in that the telescopic mechanism comprises an inner sleeve that rotates the hinge end with the chassis, two sides of the hinge end of the inner sleeve respectively extend outward to form a rotating shaft, and two of the rotating shafts are disposed on the same axis; the locking mechanism comprises a fixing head, a fixing piece, an adjusting bolt, and an adjusting piece; wherein the rotating shaft is provided with an assembling cavity, the fixing head is fixedly fitted in the assembling cavity, and the fixing head is movable synchronously with the rotating shaft; one end of the fixing piece is fixedly mounted on the chassis; wherein the adjusting piece is disposed between the fixing piece and the fixing head, and/or between the fixing piece and the adjusting bolt; the adjusting bolt is threadedly fitted to the fixing head through the adjusting piece and the fixing piece for adjusting a frictional force between the fixing piece and the fixing head.