Substation high voltage isolator

The utility model provides a substation high voltage isolator having a high voltage isolator body; the substation high voltage isolator is good in sealing effect, simple in structure, easy to install, small in maintenance amount, and can effectively prolong the life of the high voltage isolator; electrical element wet rusting oxidation in an auxiliary switch and poor contact phenomenon can be prevented, and heat radiation can be effectively carried out. A radiation layer is provided with radiation holes, so mass heat generated by the substation high voltage isolator in work can well pass the radiation holes and directly radiated by air cooling through an ion fan, thus improving radiation effect; an air outlet is fixed on the top position of a side face of a protection layer, thus enlarging air power, generated by the ion fan, travel in the protection layer, and adding cooling effect.