The utility model provides an outdoor pole-mounted high voltage combined drop-out switch, aiming to eliminate the hidden dangers of the prior outdoor high voltage drop-out switch without a breaking and grounding structure, which is a three-phase integrated combined structure. The utility model is characterized in that: a three-phase ganged ground switch is arranged at the load side of each phase, a grounded moving blade fitted with a grounded static contact switch, which is electrically connected with the static contact arranged at the load side of each phase, is fixedly arranged on the grounded universal driving shaft of the three-phase ganged ground switch; a plurality of sprocket wheels of the universal driving shaft in locking or unlocking fit with the grounded interlocking mechanism of each phase are also fixedly arranged on the grounded universal driving shaft. A crank arm connecting lever on the driven shaft of the grounded interlocking mechanism is connected with a locking bar, as well as a plurality of driven shaft sprocket wheels in locking or unlocking fit with the sprocket wheels of the universal driving shaft. By embodying the technical proposal in the utility model, the utility model has the advantages of greatly simplifying the grounding operations of the drop-out switch in breaking state, ensuring the quality of grounding, and guaranteeing the working safety of the power distribution network.