A solar power generating system includes a solar power generating device (10), a microbubble cleaning device (20) mounted on the solar power generating device, a temperature adjustment device (30) mounted on the solar power generating device, and a controller (40) electrically connected with the solar power generating device, the microbubble cleaning device, and the temperature adjustment device. The microbubble cleaning device produces a liquid containing microbubbles and is controlled by the controller to inject the liquid outward to clean a surface of the solar power generating device. The temperature adjustment device is used to regulate an ambient temperature of the solar power generating device. The controller receives data of power generation from the solar power generating device, and controls on/off operation of the microbubble cleaning device and the temperature adjustment device.