Fermentation production method for citric acid

The invention discloses a fermentation production method for citric acid, and in particular relates to a continuous fermentation production method for citric acid. A citric acid continuous fermentation system consists of a culture medium storage tank, a seed culture tank, two or more serially connected fermentation tanks and a fermentation mash storage tank. By the citric acid continuous fermentation system, a fermentation period can be saved, the conversion rate of saccharic acid and the utilization rate of the fermentation tanks are improved, and stages such as growth and development and saccharification effects of aspergillus niger on citric acid production bacteria, fermentation and acid production and the like are controllable sectionally.