The invention provides a pneumatic boosting bicycle utilizing braking complementary energy and belongs to the field of pneumatic bicycles. The pneumatic boosting bicycle utilizing braking complementary energy comprises a boosting unit, a power recycling unit and a bicycle body; the boosting unit comprises an energy supply gas tank for outputting pneumatic power; the power recycling unit comprisesan energy storage gas tank and a compression cylinder; a compression piston is arranged in the compression cylinder; the compression piston is used for compressing the gas; an adjusting piston is arranged at one end of the compression cylinder; the adjusting piston can move in the length direction of the compression cylinder; the compression cylinder is connected with the energy storage gas tank through a pipeline; the compressed gas is conveyed to the energy storage gas tank through a pipeline; and gas tank one-way gas valves are arranged on the energy storage gas tank and the energy supply gas tank. While deceleration is in need, the braking effect can be adjusted by adjusting the compression ratio of the compression cylinder and the braking complementary energy is sufficiently utilized.