The invention discloses a high-efficiency resistance reduction method for substations. The high-efficiency resistance reduction method includes the following steps: surveying the soil, establishing soil models, surveying the soil resistivity, the depth of frozen soil and the soil stratification conditions within substation site areas by surveyors through soil detectors, establishing soil models according to surveyed lateral and longitudinal soil stratification data, designing internal grounding devices within the substation site areas, and checking the safety of the designed grounding devices.The high-efficiency resistance reduction method has the advantages that carbon beds are buried in the substation site areas, high-silicon ferrochrome rods serve as main conductors of carbon bed electrodes, and resistance-reducing agents are poured into iron buckets or tanks, so that the electrical resistivity between grounding bodies and the soil can be effectively reduced, the electric conductivity of the soil in the substation site areas can be improved and maintained, the grounding resistance can reach the standard, the resistance reduction effect is improved, the lightning protection performance of the substations is enhanced, and the substations, substation personnel and equipment are protected effectively.