The invention belongs to the technical field of image analysis, and discloses an automatic-update personnel intrusion detection method based on credibility. The automatic-update personnel intrusion detection method based on credibility comprises the following steps: whether a result that there is an intruder obtained by a classifier is creditable is judged according to the composite credibility of time and position, and whether there is an intruder is decided according to the identification result; a user makes feedback based on the decision judgment result, and judges whether the identification result is wrong; and the classifier and the credibility are updated dynamically according to the feedback of the user. By introducing user feedback to dynamically update the classifier and the credibility, the identification result is optimized continuously, and the rate of false alarm is reduced.