The application discloses an OPGW (Optical Fiber Composite Overhead Ground Wire) terminal reserved cable device for an ultra-high voltage transformer substation, which solves the problems of electric corrosion and strand breakage caused by turn-to-turn discharge of a cable due to turn-to-turn induced voltage of the wound cable, avoids galvanic corrosion and strand breakage caused by contact between the cable and a binding wire, and is safe, reliable and attractive. The OPGW terminal reserved cable device comprises a non-metallic inner fork and non-metallic outer forks, wherein the non-metallic inner fork is cross-shaped; the non-metallic outer forks are arranged on the four arms of the non-metallic inner fork and form four grooves together with the four arms; an OPGW terminal reserved cable is wound in the four grooves; a plurality of cable limiting and pitch adjusting holes are formed in each of the arms of the non-metallic inner fork; a plurality of cable limiting and pitch adjusting holes are formed in the non-metallic outer forks and correspond to the cable limiting and pitch adjusting holes in the non-metallic inner fork; fastening pieces are inserted into the cable limiting and pitch adjusting holes to fix the OPGW terminal reserved cable in the grooves.