The invention provides a method for restricting the electric field intensity of soil around a grounding body and separating a soil discharge passage, and belongs to the technical field of high voltage. The method comprises the following steps: excavating a trench at a position, needing to be subjected to electric field intensity restriction, around a grounding grid, wherein the depth of the trench exceeds the burying depth of a protected object; building a support wall in a trench in which an insulation wall is buried; pasting adhesives on one side of the support wall close to the grounding body; backfilling fine earth in a gap between the insulation wall and soil and compacting after the adhesives are solidified and the insulation layer is firmly glued; and paving a gravel layer with the thickness of 20cm within 2m in the horizontal direction at the root of the front, rear, left and right ground surfaces of the insulation wall. By adopting the method for restricting the electric field intensity of soil around the grounding body and separating the soil discharge passage, the electric field intensity of soil in part areas around the grounding grid is effectively restricted, the discharge passage of lightning stroke in soil is separated, and pipelines, cables and underground oil tanks around the grounding grid of substations, microwave towers and buildings are protected.