An air-actuated power generating system, including: an air storage device; a housing assembly rotatably mounted on said air storage device; an air compressor disposed within said housing assembly and fluidly communicating with said air storage device, said air compressor being adapted to compress air into pressurized air, and to transmit the pressurized air to said air storage device; a vane assembly disposed on said housing assembly and connected to said air compressor, said vane assembly being adapted to be rotated by winds to drive operation of said air compressor; and a power generating device including an air-actuated motor that is fluidly connected to said air storage device, and a power generator that is connected to said air-actuated motor; wherein said air-actuated motor is operable by the pressurized air discharged from said air storage device, thereby driving said power generator to generate electricity; the air-actuated power generating system being characterized in that: said air storage device includes at least one storage unit that includes a plurality of air reservoirs spaced apart from each other, a plurality of communicating pipes interconnecting said air reservoirs, a first support member mounted on said air reservoirs, and a second support members mounted on said communicating pipes; each of said air reservoirs defines an air-receiving space that is adapted for receiving the pressurized air, said air-receiving space of one of said air reservoirs being directly connected to said air compressor; said communicating pipes and said air reservoirs are alternately arranged, each of said communicating pipes interconnecting said air receiving spaces of a respective adjacent pair of said air reservoirs; said housing assembly is mounted on said first support member; and said air-actuated motor and said power generator are mounted on said second support member. an air storage device; a housing assembly rotatably mounted on said air storage device; an air compressor disposed within said housing assembly and fluidly communicating with said air storage device, said air compressor being adapted to compress air into pressurized air, and to transmit the pressurized air to said air storage device; a vane assembly disposed on said housing assembly and connected to said air compressor, said vane assembly being adapted to be rotated by winds to drive operation of said air compressor; and a power generating device including an air-actuated motor that is fluidly connected to said air storage device, and a power generator that is connected to said air-actuated motor; an air-actuated motor that is fluidly connected to said air storage device, and a power generator that is connected to said air-actuated motor; wherein said air-actuated motor is operable by the pressurized air discharged from said air storage device, thereby driving said power generator to generate electricity; said air storage device includes at least one storage unit that includes a plurality of air reservoirs spaced apart from each other, a plurality of communicating pipes interconnecting said air reservoirs, a first support member mounted on said air reservoirs, and a second support members mounted on said communicating pipes; a plurality of air reservoirs spaced apart from each other, a plurality of communicating pipes interconnecting said air reservoirs, a first support member mounted on said air reservoirs, and a second support members mounted on said communicating pipes; each of said air reservoirs defines an air-receiving space that is adapted for receiving the pressurized air, said air-receiving space of one of said air reservoirs being directly connected to said air compressor; said communicating pipes and said air reservoirs are alternately arranged, each of said communicating pipes interconnecting said air receiving spaces of a respective adjacent pair of said air reservoirs; said housing assembly is mounted on said first support member; and said air-actuated motor and said power generator are mounted on said second support member.