The utility model relates to a lightning protection connector of portal frame OPGW of transformer substation optical cable. Have aluminium package steel strand wires, there are connection lug and parallel groove clamp in the both ends of aluminium package steel strand wires crimping respectively, are equipped with screw and nut on connection lug and the parallel groove clamp. During the use, be connected the one end of connector band wire nose and the band iron of portal frame lightning protection system, be connected connector area parallel groove clamp's one end and OPGW downlead. The utility model discloses simple structure, simple to operate have improved portal frame lightning protection system security nature and reliability, have promoted power communication optical cable's operation rate, this lightning protection connector is applicable to to be installed in positions such as transformer substation's portal frame top OPGW optical cable downlead, the surplus cable frame department of OPGW, OPGW fiber cable joint box departments.