The invention discloses a method for producing L-phenylalanine through multi-stage continuous fermentation. The method comprises the steps of seed culture, fermented culture and multi-stage continuous fermentation. Concretely, more than three stages of fermentation are carried out by taking Escherichia coli WR1001 as an original strain, the metabolism demands of the strain at different periods are met through controlling the fermentation conditions in the different-stage fermentation tanks, so that the conversion rate of raw materials and the yield of L-phenylalanine are increased. By using the method, the fermentation process is simplified, the yield of the L-phenylalanine is increased, and the production cost is effectively reduced.