The invention discloses a clamping device applied to an apparatus. The apparatus contains a top cover and a base. The clamping device contains a pivot component and a clamping component. The pivot component contains a limitation section. The top cover is pivoted to the base through the pivot component. The clamping device is provided on the top cover and contains a manipulation section and a clamping section. The clamping section is matched with the limitation section. When the top cover is at a closed position relative to the base, the clamping section can work together with the limitation section to form a locking joint.