The invention provides a method and a device for identifying a dangerous person. The method comprises steps: an image comprising at least one detected person is acquired; human face identification is carried out on the image to obtain the human face information of the detected person; according to the human face information and a preset database, whether the detected person is a dangerous person is judged, wherein the human face information of the dangerous person is included in the database; and if the judgment result is that the detected person is the dangerous person, the trajectory of the detected person is tracked according to the human face information, and the detected person is marked. The method realizes identification, marking and tracking on the dangerous person, and the problem that a dangerous person can not be effectively identified when the traditional explosion-proof shield is used for external observation in the prior art can be solved.