The invention relates to a method for improving the screening efficiency of curdlan gum high-yielding strains, and belongs to the microbial breeding technical field, wherein the method mainly includesthe following steps: (1) culturing starting curdlan gum-producing strains; (2) carrying out NTG mutagenesis of the starting strains; (3) preparing an aniline blue flat plate screening culture medium;(4) adding NaI and NaIO3 into the aniline blue flat plate screening culture medium; (5) carrying out initial screening of a mutagenic bacterial liquid on the aniline blue and NaI and NaIO3 double-screening flat plate culture medium; (6) carrying out fermentation re-screening with a 50 mL/250 mL shaking flask, and screening high-yielding strains according to the measured crude yield; and (7) carrying out fermentation secondary re-screening with a 75 mL/500 mL shaking flask, and screening the high-yielding strains according to the measured yield of curdlan gum. The chemical drugs NaI and NaIO3are added to the flat plate screening culture medium, the principle of producing elemental iodine in an acidic environment to kill acid-producing bacteria is used, the probability of screening the curdlan gum high-yielding strains is increased, the efficiency of the flat plate screening bacteria is improved, and the period of screening bacteria is shortened.