The invention discloses a Lactobacillus brevis for producing extracellular exopolysaccharide and application of the Lactobacillus brevis. The Lactobacillus brevis BDLB0001 provided by the invention is preserved in the general microorganism center of the China Committee for Culture Collection of Microorganisms and the preservation number is CGMCC N0.5223. The Lactobacillus brevis BDLB0001 provided by the invention has higher extracellular exopolysaccharide output and the produced extracellular exopolysaccharide is capable of stimulating the proliferation of B lymphocytes and strengthening the immunity and has wide prospects in the aspect of the application of immunity-boosting drugs, healthcare products and foods.
