The invention provides a foldable umbrella air-drying device. The foldable umbrella air-drying device comprises a hollow box body, a foldable umbrella spreading mechanism, an upper air-drying mechanism and a lower air-drying mechanism, wherein the foldable umbrella spreading mechanism, the upper air-drying mechanism and the lower air-drying mechanism are arranged in the hollow box body; the foldable umbrella spreading mechanism comprises a conical net-shaped spreading frame and a support, the support is arranged at the lower end of the conical net-shaped spreading frame, and used for supporting the top of an umbrella, and the umbrella is partially opened through the conical net-shaped spreading frame; the upper air-drying mechanism is distributed at the outer side of the net-shaped spreading frame in the radial direction, and the lower air-drying mechanism is arranged at the lower end of the support. According to the foldable umbrella air-drying device, through the upper air-drying mechanism and the lower air-drying mechanism, the umbrella is quickly air-dried; through the conical net-shaped spreading frame, it can be guaranteed that the umbrella is partially opened, and the problem that the air-drying speed is low when the umbrella is completely folded is solved; through multiple rotary wind wheels and axial fans, the air-drying speed is further increased; the foldable umbrella air-drying device is suitable for markets, banks, subways and other crowded places, and the problem that due to the existence of rainwater, the ground is slippery, and people fall over and get injured is solved.