The invention discloses a horizontal diversion cable and a deep-well vertical grounding pole, and relates to the technical field of grounding in DC power transmission engineering. The horizontal diversion cable and the deep-well vertical grounding pole are used for solving the problem how to ensure water pressure resistant performance of the horizontal diversion cable. The horizontal diversion cable comprises a conductor and a conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer and an inner sheath which sequentially wrap the conductor from inside to outside, wherein an armoring layer wraps the inner sheath and comprises a zinc-plated steel wire layer and a wrapping tape, the zinc-plate steel wire layer comprises a plurality of zinc-platedsteel wires extending along an axial direction of the conductor, the plurality of zinc-plated steel wires are uniformly arranged in a way encircling an outer wall of the inner sheath for a circle, andthe wrapping tape is wound around the zinc-plated steel wire layer so that the plurality of zinc-plated steel wires are fixedly arranged on the inner sheath. The horizontal diversion cable is used for the deep-well vertical grounding pole.