The invention relates to an isolating switch, in particular to a super high voltage low corona compound pier like isolating switch. Each phase comprises two fixed stationary contact insulated prop stay groups and one moveable contact insulated prop stay group which is arranged between the two fixed contact insulated prop stay groups; stationary contacts are installed on the top ends of the stationary contact insulated prop stays, connecting rods are installed on the top ends of the moveable contact insulated prop stays, and moveable contacts are arranged on the top ends of the connecting rods.Each stationary contact insulated prop stay group includes three parallel fixed columns and three fixed columns which are arranged in an equilateral triangle; the moveable contact insulated prop staygroup includes four parallel fixed columns and a rotary column; both the fixed columns and the rotary column are composed of a plurality of insulated bars which are inserted one by one and are provided with insulated skirts; both ends of the insulated bars are provided with anti-corona rings; the lower ends of the fixed columns are fixed on a pedestal; the lower end of the rotary column is in transmission connection with a drive mechanism and the upper end of the rotary column is fixed with an actuator; both the insulated prop stays and the equalizing ring adopt the structure of distributed toy bricks, thus greatly reducing production cost and transportation cost; the isolating switch is firm in structure and low in making cost and is easy to install, and can effectively lower the lumpedvoltage, prolong the service life of the component parts and reduce wireless interference.