The invention discloses a method for producing ganoderma triterpenes by liquid submerged fermentation. The method comprises the following steps: (1) taking ganoderma lucidum mycelia activated in a slant culture medium, picking sclertium and inoculate a seed culture medium with the sclertium , and culturing under the conditions of 25 to 30 DEG C and 100 to 180 r/min for 8 to 12 days after the inoculation to obtain a seed culture solution; (2) inoculating a fermentation medium according to the inoculation quantity of 8 vol% to 12 vol% with cultured seed culture solution, culturing under the conditions of 25 to 30 DEG C and 100 to 180 r/min for 7 to 10 days after the inoculation, adding 0.8 g/L to 1.5 g/L sodium cholate during the fermentation culture process to obtain ganoderma lucidum mycelia after the fermentation is finished, and extracting the ganoderma triterpenes from the mycelia. The method disclosed by the invention has the advantages of simple and effective process; the method has an application value in industrial production; the purpose of obviously increasing the content of expression products can be successfully achieved; the fermentation cycle is shortened; the production efficiency is improved; certain guidance and enlightenment significance is realized for the optimization of the fermentation process of other fungal mycelia.