Large-scale propagation technology of high-efficiency mycorrhizal fungus inoculant

The invention discloses a large-scale propagation technology of a high-efficiency mycorrhizal fungus inoculant, which comprises the following operation steps: loading a sterilized soil and river sand mixed matrix into a cultivation tank, then laying a layer of crop straw fiber woven mesh loaded with the fungus inoculant, then laying the sterilized soil and river sand mixed matrix, thoroughly watering, then sowing host plant seeds, and finally, carrying out high-efficiency large-scale propagation of the mycorrhizal fungus inoculant. A layer of sterilized soil and river sand mixed matrix is covered, a layer of film is covered above the cultivation tank for moisturizing, watering is performed on time, an improved Hoagland nutrient solution is irrigated once every 12-15 days, and the film is uncovered after seedlings emerge; 70-100 days after sowing, the spore density is detected, and harvesting can be conducted after the spore density reaches the standard. After harvesting, separating root systems from the steri