The invention discloses a substation circuit breaker state video intelligent analysis algorithm using transverse scan mapping. The method comprises the following steps of: segmenting an image based on a label of the image to obtain a scope of image needed to be processed; performing filtering and binaryzation on the original image, and converting the original image into a binary image; scanning the converted binary image with multiple groups of transverse segmentation lines, adopting a sliding window to scan periphery of each of a series of cross points formed by the transverse segmentation lines for scanning and the binary image, and determining which cross points are in the same line segment; solving segment slope of each line; judging which line segments in the binary image are actual opening and closing instructions according to each segment slope, and finally judging the opening and closing state shown by the direction of a pointer on a mechanism case. Image recognition in the algorithm provided by the invention has important significance to monitoring on production run of a power grid, and has certain acceleration effect on development and improvement of intelligent level of the power grid.