The invention belongs to the fields of microbes and food biotechnologies, and concretely discloses a loose tea Eurotium cristatum fermentation technology. The technology comprises the following steps: 1, rehydrating gross tea by a rehydrating machine to make the water content reach 16-35 wt%; 2, adding the rehydrated gross tea to a rotary bottling machine to make the rehydrated gross tea be packaged in charging bottles, stacking the bottles, placing the charging bottles to a high-temperature and high-pressure sterilizer, sterilizing the charging bottles, adding the sterilized charging bottles into a cooling room, cooling the charging bottles to 30-80 DEG C, placing the cooled charging bottles into an inoculation room, and carrying out inoculation; 3, adding the inoculated charging bottles into a fermentation room, and carrying out fermentation at 20-40 DEG C under a humidity of 30-75% for 6-10 d; and 4, adding the fermented tea leaves to an automatic discharging machine, taking out the tea leaves from the charging bottles, placing the tea leaves in a drying disc, and drying the tea leaves until the water content is 5-12 wt%. The technology has the advantages of uniform Eurotium cristatum growth, high Eurotium cristatum growth capacity, obvious Eurotium cristatum, simplicity and high standardization degree, so the product quality is safe and controllable, the health effects of the product are further enhanced, and the product quality is excellent.