The invention relates to a method for all-year production of coprinus comatus by the utilization of a soil cave. According to the method for all-year production of coprinus comatus by the utilization of the soil cave, grain stillage serves as raw materials for cultivation, the soil cave serves as environment for cultivation, the cultivation mode that spawn running and fruiting are carried out in the soil cave is adopted, and the method includes the eight implementation steps of excavation of the soil cave, production of coprinus comatus seeds, preparation of cultivation materials, fermentation treatment of the cultivation materials, production of coprinus comatus bags, spawn running of the coprinus comatus bags, earth covering and management on fruiting. The manually excavated soil cave is utilized as a production place, the cultivation mode that spawn running and fruiting are carried out in the soil cave is provided, spawn running is directly carried out in the soil cave after the coprinus comatus bags are filled with coprinus comatus, earth covering and fruiting are carried out directly after spawning running is carried out, no cooling or heating equipment is needed, growth of coprinus comatus entities is met in the natural state, and all-year production of coprinus comatus is achieved. The grain stillage is used as the new raw materials of cultivation, the time for processing the cultivation materials is shortened, labor expenses are lowered, and production cost is lowered.