The invention relates to a floor climbing and flat ground dual-purpose bicycle which is characterized by being composed of a frame, a seat
saddle, a damping spring, a front wheel, a back wheel, a bicycle chain, a hand
brake and a pedal mechanism. Each wheel is composed of a
brake disc, a center disc, a center gear, four
planet gears and four arc wheel blades, each arc wheel blade and the corresponding
planet gear are installed on the center disc through a hinge in a connected mode, a limiting groove is formed in each center disc, the two ends of the limiting grooves are respectively provided with a concave limiting hole, and a limiting spring and a limiting ball are arranged on each center gear. The arc wheel blades rotate around the hinges by a certain angle to enable circular wheels to be converted into impellers, rims of the impellers approach a floor climbing Archimedes
helical line corresponding to stair sizes, and floor climbing is accordingly achieved. Compared with other bicycles, the floor climbing and flat ground dual-purpose bicycle has the advantages of being capable of easily and rapidly running on
stairs, enabling floor climbing to be safe and increasing riding enjoyment, and can be used for a novel bicycle floor climbing athletics object.