Adjustable inflatable lower limb supporting ring

The utility model discloses an adjustable inflatable lower limb supporting ring which comprises a sponge ring body, a C-shaped air bag is movably connected to the inner ring of the sponge ring body, air is injected into the C-shaped air bag through a one-way air nozzle and an air pipe, so that an elastic protruding part is bulged to be clamped and fixed on a limb, installation and use of the device are achieved, and the C-shaped air bag is controlled through the air. According to the device, the inflation degree of the C-shaped air bag can be controlled according to the air injection amount, the device is used for adapting to individuals with limbs of different thicknesses, slipping is avoided during use, independent replacement can be conducted after a single part of the sponge ring body or the C-shaped air bag is damaged, the C-shaped air bag is arranged to be a plurality of independent and communicated cavities, and the device is convenient to use. A non-contact area is reserved between the C-shaped air ba