Changeable sofa

The utility model relates to a sofa, particularly to a changeable sofa. The changeable sofa comprises a backrest and a cushion, and further comprises a deformation layer, wherein the bottom of the backrest is hinged to the cushion, the deformation layer is arranged on the cushion, the deformation layer comprises one or more deformation blocks, one ends of the deformation blocks are hinged to the cushion, and the deformation blocks can be unfolded to be arranged in the same plane together with the cushion, and can be turned over to be overlapped on the cushion. According to the changeable sofa, by using the coordination function of the deformation layer and the backrest, various shapes can be achieved, for example, the deformation blocks are unfolded, so that a large floor mattress is formed; the deformation blocks are folded, a conventional sitting type long sofa is formed; one deformation block is unfolded, so that a concave seat is formed, the folded deformation blocks adjacent to the unfolded deformation block can be used as armrests, and the unfolded deformation block can be used for putting feet, so that the sofa is changeable in shape, and wide in adaptability.