Sterilization method for flammulina velutipes fermentation tank

The invention relates to a sterilization method for a flammulina velutipes fermentation tank. The sterilization method includes the following steps that the temperature is raised and kept at 105 DEG C for 15 min; the temperature is raised and kept at 115 DEG C for 15 min; the temperature is raised and kept at 121 DEG C for 60 min; in the whole sterilization process, the fermentation tank is kept to be communicated with the outside, and air pressure in the fermentation tank is controlled at 0.15 MPa. In the sterilization process, the method that the fermentation tank is externally ventilated is adopted, ventilation limited pressure is 0.15 MPa, the sterilization effect on a culture medium in the fermentation tank can be realized, the sterilization temperature peak value is kept below 120 DEG C, in this way, the sterilization effect is achieved, the sterilization temperature is lowered, the temperature in the tank is lower than or equal to 120 DEG C, damage to nutrition ingredients by the high temperature is effectively reduced, and the sterilization time is shortened within a certain range compared with a mainstream sterilization mode.