Face recognition-based school safety management early warning method for K12 education stage

The invention discloses a face recognition-based school safety management early warning method for a K12 education stage. According to the method, a portrait template is established at a terminal andis in data synchronization with a server; an image pickup device shoots a video to form a video stream and uploads the video stream to the server; the server randomly intercepts a frame of picture from the video stream and compares the picture with the portrait template, if the comparison is successful, it is indicated that a visitor can be allowed to enter a school, and a door is opened; and if the comparison is unsuccessful, visitor registration is reminded, valid visit time is set, a visited person is selected, and a registered face picture is stored in a visitor registration group; the visitor can enter the school through face recognition within a validity period, and visitor information is automatically classified into a historical registration person group after the valid visit timeis expired; and re-registr