Double-layer foot pad

The utility model discloses a double-layer foot pad. The air bag comprises an upper air bag and a lower air bag which are overlapped and fixed together, the upper air bag is provided with an upper airinlet and an upper air outlet; the lower air bag is provided with a lower air inlet and a lower air outlet, the upper air inlet is larger than the upper air outlet, the lower air inlet is larger thanthe lower air outlet, when the upper air bag and the lower air bag are filled with air, the upper air bag and the lower air bag are gradually decreased from bottom to top, the bottom of the upper airbag is equal to the top of the lower air bag in size, and the top of the upper air bag is provided with a downwards-concave arc-shaped groove. By means of the double-layer structure, supporting at two heights is achieved, meanwhile, the arc-shaped groove in the top of the upper air bag can increase the contact area with the foot, pain, caused by long-time supporting, of a patient is avoided, theupper barometer and the lowe