The invention provides an anti-freezing-rain method and apparatus for a solar power supply device in a polar region, and a power supply device. The anti-freezing-rain method comprises: the generating efficiency of a solar power supply is detected; and when the generating efficiency is lower than preset generating efficiency, ice covering a solar cell panel of the solar power supply is eliminated. Because the generating efficiency of the solar power supply is detected and the ice covering the solar cell penal is eliminated based on the generating efficiency, the light transmittance of the solar cell panel is guaranteed effectively, so that the generating efficiency of the solar cell panel is improved and normal operation of the solar power supply is ensured.