The utility model discloses a three-station pole-mounted isolation switch with a grounding function. The problem that the existing device cannot be connected with a ground wire is solved. The three-station pole-mounted isolation switch is characterized in that grounding metal pillars are arranged on a bearing and the right side of a silicon rubber insulation pillar II; grounding drainage bolts are arranged on the grounding metal pillars; and a grounding station latch is arranged on an open-close knife. According to the utility model, the state of a line of a work section quickly changes from running to cold standby and to overhaul; time and labor intensity for an operator to hang and remove a grounding wire in the field are reduced; the personal safety of the operator is ensured; and power supply can be quickly overhauled and restored.