The invention discloses an outdoor alternating-current high-voltage isolating switch which comprises a switch base, insulators, arc suppression rods, a movable conductive plate, a fixed conductive plate, a movable conductive contact, a protection hood and an isolation switch operating mechanism. The switch base is fixed to a switch fixing frame. The insulators are hinged to the switch base through rotating shafts. The top end of one of the insulators is provided with the movable conductive plate, and one side of the movable conductive plate can make contact with the movable conductive contact. The isolation switch operating mechanism comprises a drive circular disc. The drive circular disc is provided with two protruding shafts. The protruding shafts are arranged in inner grooves in transverse sliding plates. The transverse sliding plates are fixedly connected with one ends of two pull rods. The other ends of the pull rods are connected with fixed transverse rods in the insulators through shafts. The outdoor alternating-current high-voltage isolating switch has the advantages that due to the fact that a double-drive structure is adopted, the rotating angle of each insulator can be reduced, and accurate positioning is facilitated; furthermore, a structure of a certain arm of force is adopted, and compared with a structure that the insulators are driven to rotate only through shaft rotation, the stress structure is more reasonable.