The invention belongs to the field of microbes, and particularly relates to a Bacillus licheniformis continuous culture method and a special fermentation system. The method comprises the following steps: (1) inoculating a Bacillus licheniformis strain into a test tube slant culture medium, activating the strain, sequentially inoculating into a triangular flask a seeding tank, and culturing, thereby preparing the Bacillus licheniformis seeds; (2) taking a culture medium composed of starch/glucose, corn flour, bean pulp powder, (NH4)2HPO4, NaCl, CaCl2, MgSO4.7H2O, KH2PO4, K2HPO4, MnSO4, a defoaming agent and water; and (3) sterilizing the culture medium in the step (2), inoculating and activating the cultured Bacillus licheniformis seeds, and carrying out three-stage continuous culture, thereby obtaining the final fermentation liquid. The method implements high mechanization and automation, and the Bacillus licheniformis has stable and uniform quality and can not have the phenomena of infectious microbe pollution and strain variation. The method prolongs the service lives of detecting instruments, saves the time, enhances the yield and production efficiency, and increases the Bacillus licheniformis strain concentration and spore rate.