The invention discloses high-adenosine and high-ergosterol fermented cordyceps sinensis fungus powder and a production method thereof, and relates to the technical field of fermented cordyceps sinensis fungus powder. The production method comprises the following steps: pumping fermentation broth that meets requirements into a raw material storage tank, and controlling tank pressure, material temperature and storage time; then filtering, pH change before and after filtering is less than or equal to 1.0, separating mycelium from the filtrate and removing fermentation broth; pumping into a concentration buffer storage tank, controlling storage vacuum degree, temperature and storage time, then concentrating, pH change before and after concentration is less than or equal to 1, and discharging; and putting the discharged material into a storage tank with a dry buffer after passing through an ultrahigh-temperature sterilizer at 135-180 DEG C for 4-7 seconds, controlling vacuum degree and storage time, and finally drying, crushing and the like to obtain a finished product. The method has beneficial effects that product quality is improved by controlling tank discharge standard, filtering, concentrating, drying and other process conditions, water content of the finished product is 1.0-7.0%, adenosine content is greater than or equal to 0.32%, and ergosterol content is greater than or equal to 0.4%.