The invention discloses a stereo crossed steel wire working system of a marine drilling platform. The stereo crossed steel wire working system comprises a derrick, a drill floor, a drilling rising pipe, a steel wire rising pipe, a steel wire blowout preventer, a Christmas tree, a drilling blowout preventer, a steel wire rope, a steel wire winch, a diesel engine and a wellhead small platform, and the Christmas tree is mounted on the wellhead small platform and provided with an operation scaffold in an overlapping mode; the upper portion of the Christmas tree is sequentially connected with the steel wire blowout preventer, the steel wire rising pipe and a steel wire sky pulley, the bottom of the drill floor is provided with a hanging point, and the upper end of the steel wire sky pulley andthe hanging point are connected through a hanging rope; and one end of the steel wire rope penetrates through the steel wire sky pulley to be connected with the steel wire rising pipe and the steel wire blowout preventer, and the other end of the steel wire rope penetrates through a steel wire ground pulley to be connected with the steel wire winch. According to the stereo crossed steel wire working system of the marine drilling platform, by selecting the suitable high place hanging point at the drilling floor, a drilled well wellhead is successfully avoided, drilling operation of a drilling rig is achieved, meanwhile, the wellhead platform conducts steel wire operation, the occupied operation time of the drilling rig is greatly reduced, and the operation aging is improved.