The invention discloses a preparation method for a flexible compound corrosion-resistant grounding material, and belongs to the technical field of grounding material preparation. According to the method, mixed reaction is carried out on iron powder, silicon powder and so on; the materials are prepared into a blank through hot rolling; wire drawing and annealing are carried out to obtain alloy fibers; mixed reaction is carried out on the alloy fibers, polyvinyl chloride resin, octadecylamine and so on; the alloy fibers are wrapped by resin; expanded graphite and coupling reagent are added to the alloy fibers wrapped by the resin, and stirring reaction is carried out; the resin is wrapped by the graphite; the resin wrapped by the graphite is rolled into the blank; the blank is cooled, is leached by alkaline and is washed by deionized water; mixed soaking is carried out on the purified blank, copper sulfate and absolute ethyl alcohol; and the finally processed blank is dried in the air, thereby preparing the flexible compound corrosion-resistant grounding material. According to the method, the preparation steps are simple; the alloy fibers are wrapped through full utilization of the resin; the flexible compound corrosion-resistant grounding material is prepared by wrapping the resin through the graphite; the pertinence is high; the corrosion-resistance and low flexibility problems are solved effectively; there is no corrosion phenomenon after the material is employed for 10-12 years; the obtained product is easy to transport and construct; the clearance between the product and soil is little; the cost is low; and the material is not liable to steal.