A system for cultivating Ophiocordyceps Sinensis, characterized in that it comprises: a Hepialus moth trapping device, wherein the Hepialus moth trapping device is used for trapping Hepialus moth and collecting Hepialus moth eggs; a Hepialus moth eggs screening device, wherein the Hepialus moth eggs screening device is connected with the Hepialus moth trapping device; and wherein the Hepialus moth eggs screening device is used for screening the Hepialus moth eggs automatically and collecting the screened Hepialus moth eggs quantificationally; an ascospores-collecting device, wherein the ascospores-collecting device is used for collecting ascospores of Ophiocordyceps Sinensis a mycelia-preparing device, wherein the mycelia-preparing device is used in liquid fermentation of Hirsutella sinensis to obtain mycelia thereof; a conidia-preparing device, wherein the conidia-preparing device is used in solid fermentation of Hirsutella sinensis to obtain conidia thereof; an infection device, wherein the infection device is connected with the ascospores-collecting device, the mycelia-preparing device and the conidia-preparing device; and wherein the infection device is used for infecting Hepialus moth larvae with infective liquid; and wherein the infective liquid contains Ophiocordyceps Sinensis ascospores, Hirsutella sinensis conidia and Hirsutella sinensis mycelia; and a feeding device, wherein the feeding device is connected with the Hepialus moth eggs screening device and the infecting device; and wherein the feeding device is used for incubating the screened Hepialus moth eggs and feeding the infected Hepialus moth larvae to obtain Ophiocordyceps Sinensis, a Hepialus moth trapping device, wherein the Hepialus moth trapping device is used for trapping Hepialus moth and collecting Hepialus moth eggs; a Hepialus moth eggs screening device, wherein the Hepialus moth eggs screening device is connected with the Hepialus moth trapping device; and wherein the Hepialus moth eggs screening device is used for screening the Hepialus moth eggs automatically and collecting the screened Hepialus moth eggs quantificationally; an ascospores-collecting device, wherein the ascospores-collecting device is used for collecting ascospores of Ophiocordyceps Sinensis a mycelia-preparing device, wherein the mycelia-preparing device is used in liquid fermentation of Hirsutella sinensis to obtain mycelia thereof; a conidia-preparing device, wherein the conidia-preparing device is used in solid fermentation of Hirsutella sinensis to obtain conidia thereof; an infection device, wherein the infection device is connected with the ascospores-collecting device, the mycelia-preparing device and the conidia-preparing device; and wherein the infection device is used for infecting Hepialus moth larvae with infective liquid; and wherein the infective liquid contains Ophiocordyceps Sinensis ascospores, Hirsutella sinensis conidia and Hirsutella sinensis mycelia; and a feeding device, wherein the feeding device is connected with the Hepialus moth eggs screening device and the infecting device; and wherein the feeding device is used for incubating the screened Hepialus moth eggs and feeding the infected Hepialus moth larvae to obtain Ophiocordyceps Sinensis,