Automatic overvoltage adjustment and protection device

The invention discloses an automatic overvoltage adjustment and protection device. The automatic overvoltage adjustment and protection device comprises a wire and a cross arm, wherein an adjustment rod is fixedly arranged on an installation plate at one side of the cross arm, the adjustment rod sleeves a sleeve at the bottom of the insulator body, a protection device is arranged at the top of theother side of the cross arm and is matched with the insulator body, the protection device comprises a wiring spherical electrode, a grounding spherical electrode and a parallel gap, the parallel gap is arranged between the wiring spherical electrode and the grounding spherical electrode, the wiring spherical electrode is arranged on an upper fixed fitting, the upper fixed fitting is fixedly arranged on the wire, the grounding spherical electrode is fixedly arranged on a lower fixed fitting and communicates with a current limiting component, an adjustment sleeve at the bottom of the current limiting component sleeves an outer side of a support rod, the bottom of the support rod is welded onto a sliding block, and the sliding block is connected with a sliding groove in the top of the cross arm in a sliding way. By the automatic overvoltage adjustment and protection device, an insulator can be effectively protected, the service lifetime of the insulator is prolonged, and the reclosing success rate of a circuit also can be improved.