The invention provides a three-station isolation switch. The three-station isolation switch comprises a movable contact, an operating mechanism, and an isolation static contact, a middle static contact and a grounding static contact which are arranged in an inclined manner from the top to bottom in sequence; the operating mechanism and an insulating main shaft are in transmission connection; a transmission assembly is arranged between the insulating main shaft and the movable contact; the movable contact is arranged in the middle static contact and can move in the middle static contact up and down under the drive of the insulating main shaft, and used for being connected with the isolation static contact or the grounding static contact; a first insulating cylinder is connected between the isolation static contact and the middle static contact to enable the central lines of the isolation static contact and the middle static contact to be positioned on the same straight line; and a second insulating cylinder is connected between the middle static contact and the isolation static contact to enable the central lines of the middle static contact and the isolation static contact to be positioned on the same straight line. By virtue of the three-station isolation switch, the problem that the central lines of the three static contacts cannot be positioned on the same straight line in the assembling of the isolation switch in the prior art can be solved.