The invention provides a single-pole and double-cable OPGW redundant cable installation fitting and method for a substation. The single-pole and double-cable OPGW redundant cable installation fittingmainly comprises an installation fitting, wherein the installation fitting comprises paired voltage-limiting devices, paired cable leading devices and paired redundant cable drums; and the paired voltage-limiting devices, the paired cable leading devices and the paired redundant cable drums form two sets of OPGW redundant cable inventory fittings. According to the single-pole and double-cable OPGWredundant cable installation fitting and method for the substation, through the arrangement of the two sets of OPGW redundant cable inventory fittings, strands breaking during leading-down of the OPGW can be ensured and the problem that the space of a compact substation is insufficient can be solved.