The invention provides a hericium erinaceus cultivation method, in particular to a technology of applying mushroom roots to hericium erinaceus cultivation. Compared with the prior art, the hericium erinaceus cultivation method has the advantages that 1, a mushroom root soaking solution and cultivation raw materials are blended and are subjected to piling fermentation, so that propagation of beneficial microorganisms is promoted, microbia flora in the cultivation material is improved, and catalytic decomposition of the cultivation material is quickened; 2, the fermented cultivation material comprises high-activity beneficial bacteria and active metabolites thereof, so that an effect of promoting the growth of hericium erinaceus hypha is achieved, i.e., the hypha growth is vigorous and the infectious microbe resistant capability is high; 3, after second and third flushes are collected, the effect of rejuvenating the hypha by use of the mushroom root soaking solution is good, an effect of promoting formation of hericium erinaceus primordium and growth of solid is achieved, the yield is obviously improved, the problem of hericium erinaceus quality decline caused by long-term use of pesticides, bacteriocides and chemical synthetic fertilizers is solved, and the hericium erinaceus quality is improved; 4, resources of manpower, coal carbon and the like are saved, environment pollution is reduced, and the hericium erinaceus cultivation method conforms to the low-carbon and environment-friendly concept.