The utility model discloses a cable laying device for a cable bridge of a basement power distribution station. The device comprises a pay-off rack and a traction rack, the pay-off rack and the traction rack are both of a telescopic structure, the inner side of the top of the pay-off rack is rotationally connected with a height-adjustable cable roller, a height-adjustable movable pulley is hung onone side of the top of the traction rack, a steel wire rope is arranged on the movable pulley, and the steel wire rope pulls a cable to bypass the cable roller to enter the cable bridge. The cable laying device is suitable for cable laying of the basement power distribution station, can effectively avoid the problems of inconvenient construction and cable abrasion caused by manual cable laying, and improves the construction efficiency and quality; the building requirements in basements with different heights and the cable laying requirements in cable bridges with different heights can be met,the use is flexible, and the universality is good; the assembled structure is adopted, carrying is convenient, temporary and rapid assembling, erecting, disassembling and transferring on a construction site are facilitated, the structure is simple, the manufacturing cost is low, and practicability is high.