The invention discloses a self-cleaning aeronautical light, wherein a cleaning system comprises: a lifting table, a humidity sensor, a 360-degree holder and banister brushes. When the aeronautical light works normally, at the moment, the cleaning system retracts into a base under the aeronautical light, without shielding light. In rainy days, the atmospheric moisture is increased, and when the numerical value of the humidity sensor reaches a certain threshold, the system judges as the rainy day, at the moment, the lifting table controls the cleaning system to rise, the four banister brushes just cling to the aeronautical light lampshade, while a rear steering engine holder rotates by 360 degrees, so as to drive the banister brushes to clean the lampshade by utilizing rainwater. After cleaning for a period of time, the cleaning system re-retracts into the base, and the cleaning action is not triggered again in one month. The self-cleaning aeronautical light effectively utilizes naturalrainwater of rainy days, saves a water tank and a water pump, and is simple in structure, low in cost and good in safety.