An automatic target point tracing method, marking a target object in an image acquired by the sighting system to obtain a target point, performing feature extraction and feature description on the image with the target point, and establishing a ridge regression classifier and performing learning training on the classifier according to the extracted features; calculating a regression score of the features of the real-time acquired image in the trained ridge regression classifier, determining that the target point is automatically recognized when the regression score reaches a requirement, and displaying an orientation of the target point in a display unit area; and determining that the target object disappears when the regress core does not reach the requirement, and performing searching near a position where the target object disappears.