The invention discloses a switch disconnector with a three-color display function. The switch disconnector with the three-color display function structurally comprises a bottom plate, a movable contact, a static contact, a display block and a mechanism supporting seat, wherein the movable contact, the static contact, the display block and the mechanism supporting seat are arranged on the bottom plate, a vision window is formed in the bottom plate, the display block and the mechanism supporting seat are coaxially and rotationally installed on the bottom plate, the display block is provided with a three-color display surface corresponding to the vision window in position, a trigger is arranged between the mechanism supporting seat and the display block and rotationally installed on the display block, an elastic arm is arranged at one end of the trigger and abuts against the inner end surfaces of display surfaces of the display block, and the surface, making contact with the mechanism supporting seat, of the other end of the trigger is provided with a lock capable of preventing rotation of the display block. When the movable contact and the static contact are in three different states of switching off, switching on and faults, the lock carries out unlocking or locking correspondingly, and different vision sections of the display block are controlled to correspond to the vision window. By means of the design, the operation of switching the different display surfaces of the display block is small in resistance, fast in motion and small in error.