Method for observing isolating switch break of ring main unit and device thereof

The invention provides a method for observing an isolating switch break of a ring main unit and a device thereof. Solar energy is acquired through a solar cell panel and is converted to electric energy. An illuminating lamp is driven for illuminating an isolating switch blade. The image of the isolating switch blade is acquired through an endoscope, and furthermore the acquired image is transmitted to a display terminal for displaying. No external power supply connection and no internal placement of dry cells which require frequent replacement are realized. The method of the invention can sufficiently ensure high safety of personnel and ring main unit equipment and saves cost.