The utility model discloses a one-to-two grounding pile specially used for a substation five-prevention lock. The one-to-two grounding pile comprises a grounding pile, a lower portion of the grounding pile provided with a pressed tube type five-prevention lock, an upper portion of the grounding pile is provided with a horizontal metal plate, and two ends of the horizontal metal plate are provided with threaded holes. The one-to-two grounding pile can be well connected with an original grounding pile together, the purpose of increasing the grounding piles is achieved without destroying the original grounding pile, the potential safety hazard that grounding wires cannot be installed or grounding terminals are grounded irregularly (for example winding) due to the fact that the number of the grounding piles is insufficient can be prevented, and safety level is increased; the surface of the grounding pile is provided with a galvanizing coating layer, so that poor contact caused by surface aerugo can be surely prevented under the external climate of the substation, especially at welding positions; the threaded holes are disposed to enable the grounding wires to be disassembled and assembled rapidly; and the one-to-two grounding pile is simple in structure and easy to operate, the practical value is maximally developed under the condition of the same resources, and the one-to-two grounding pile is worth of being applied and popularized.