The invention belongs to the technical field of unmanned sweeping devices, and specifically relates to an unmanned sweeping device for power insulators. The unmanned sweeping device mainly solves the technical problems of time and energy waste and insecurity when the existing power insulators are swept by manual wiping. The unmanned sweeping device for power insulators comprises an unmanned aerial vehicle, a water tank, an electromagnetic valve, a wireless camera, a water pipe, a sprinkler and a water pump, wherein the water tank is arranged at the middle part of the belly of the unmanned aerial vehicle, the water pump is arranged at the bottom of the inner cavity of the water tank, the water pipe is arranged on the unmanned aerial vehicle, one end of the water pipe is connected with the water outlet of the water pump, the sprinkler is arranged at the other end of the water pipe, the electromagnetic valve is arranged on the water pipe, and the wireless camera is arranged on one side of the unmanned aerial vehicle. The unmanned sweeping device has the advantages that the working efficiency is high and the risk caused when a maintainer climbs to carry out short-distance hot-line operation is avoided.