The invention belongs to the technical field of aerospace and particularly relates to a skin structure and a connecting method. The skin structure comprises skin boards, buckles and locating pieces. The locating pieces are fixedly arranged on the skin boards and can be matched with fixing devices on to-be-connected pieces, so that the skin boards are fixed to the relative positions of the to-be-connected pieces. Each buckle is fixedly arranged at one end of the corresponding skin board, the buckles are provided with openings capable of being connected with the end faces of the to-be-connectedpieces in a matched mode, and the openings in the buckles are matched with the end faces of the to-be-connected pieces so that the skin boards can be fixedly connected to the to-be-connected pieces. By the adoption of the skin structure and skin installation and detachment methods, the skin installation and detachment processes can be quickly finished, the connected structure is more stable and reliable, seamless connection can be achieved, and the installation size is guaranteed.