The invention provides a method for evaluating the fineness and smoothness of bear foam. The method includes: pouring to-be-evaluated beer into the beer container until the generated foam is higher than the upper edge of the beer container; when the foam lowers to be parallel with the upper edge of the beer container, shooting the foam with a camera in an overlook manner to obtain a foam picture;selecting an area, with uniform-sized bubbles, in the foam picture to serve as a representative area, recording the number of bubbles contained in the representative area, and calculating the actual area of the representative area and the number of bubbles in unit area; evaluating that the foam of the to-be-evaluated beer is fine and smooth when the number of bubbles in unit area is more than 2000/cm<2>, and evaluating that the foam of the to-be-evaluated beer is coarse when the number of bubbles in unit area is less than 2000/cm<2>. The method has the advantages that the fineness and smoothness of the beer foam is characterized quantitatively by the number of bubbles in unit area, and the evaluation results are high in accuracy and unaffected by subjective factors.