A wind-powered electricity generator has a supporting tube, a rotating device, a drive device, a mounting frame, a guiding board and two fan bodies. The rotating device is rotatably mounted on the supporting tube and has a mounting tube, a top cover and a transmitting shaft. The drive device is mounted in the supporting tube and is connected to the transmitting shaft. The mounting frame is securely mounted on the mounting tube and has a spindle, a gear wheel and a dynamo. The guiding board is connected to the mounting frame, faces the wind in used and has multiple spindle rings, multiple pivotal panels, multiple linking arms, a driving shaft and an expansion device. The fan bodies are rotatably mounted around the spindle in the guiding board and each fan body has a central axle, multiple connecting tubes, multiple blades, two annular frames, multiple cross bars and multiple pull bars.