The invention relates to a single-degree-of-freedom deformable wheel, in particular to a single-drive deformable wheel which can realize expansion and contraction of the deformable wheel by adjustingthe distance between an upper platform and a lower platform so as to enable the wheel to acquire different wheel diameters and contact areas with the ground so as to achieve stronger adaptive capacityto environment. The single-degree-of-freedom deformable wheel is composed of a lower bottom surface (1), a first wheel surface (2), a first fold surface (3), a second fold surface (4), a second wheelsurface (5), a third fold surface (6), a fourth fold surface (7), a third wheel surface (8), a fifth fold surface (9), a sixth fold surface (10), a fourth wheel surface (11), a seventh fold surface (12), an eighth fold surface (13), a fifth wheel surface (14), a ninth fold surface (15), a tenth fold surface (16), a sixth wheel surface (17), an eleventh fold surface (18), a twelfth fold surface (19), a first supporting rod (20), a second supporting rod (21), a third supporting rod (22) and an upper top surface (23) based on a closed chain mechanism.