The invention discloses a flame recognition method based on video images, belongs to the field of fire-fighting fire monitoring, and particularly relates to a flame recognition method. The problem that an existing flame recognition method is low in accuracy is solved. The method comprises the following steps: acquiring a video image, determining whether a flame occurs through a difference method,and preprocessing a suspected image of the flame; carrying out feature extraction on the suspected area, wherein the features comprise geometric features, color features and flame dynamic features; wherein the geometrical characteristics comprise flame roundness, boundary roughness and the number of sharp corners; wherein the flame dynamic characteristics comprise the flame area change rate, the flame mass center displacement and the intensity degree of flame sharp corner number change; carrying out training through a support vector machine (SVM) to obtain a trained flame recognition classifier; and carrying out flame recognition by using the trained flame recognition classifier. The method is suitable for flame identification of video images.