The invention belongs to the technical field of biology, and relates to a bacterial strain for high-producing bacterial polysaccharide and a method thereof for preparing polysaccharide by fermenting traditional Chinese medicinal waste. The bacterial strain is preserved in the China Center for Type Culture Collection (CCTCC); the preservation number is CCTCC M 2016273. A bacterial strain of intermediate ochrobactrum ZY03 is inoculated in a culture medium with a sucrose content of 10g/L; the yield of the polysaccharide can reach 6g/L at most; the conversion ratio can reach 67 percent at most.