The utility model discloses a get electric installation based on insulating overhead earth wire, it includes to get the electric installation: with one section the auto transformer of first electric current is connected and acquire to the wire, and is right first electric current carries out obtaining the second electric current after the vary voltage is handled, with the wave filter that auto transformer connects, it is right the second electric current carries out the post -filter and obtains the third electric current, with the electric -air valve that the wave filter is connected, based on the third electric current produces first air current, with the air pressure adjusting valve that the electric -air valve is connected, based on first air current carries out the stable second air current of output after the steady voltage, with the pneumatic motor that air pressure adjusting valve connects, based on the second air current produces and rotates, with the generator that pneumatic motor connects, based on generate current rotates. Overhead earth wire induced -current - mechanical energy - the auto transformer transformation ratio has been solved in the conversion of electric current can not be too big through the insulation, and induced -current carries the change of load, external environment condition along with transmission line and leads to using the problem of electric current shakiness.