The invention provides an abnormal condition management method based on a video lock, the video lock, a system and a device, and the method comprises the steps: S101, obtaining an active defense parameter according to an input instruction, and enabling an active defense function according to the active defense parameter; S102, acquiring detection information of the lock end, acquiring external information of the lock end through the detection information, judging whether an abnormal condition occurs or not according to the external information and the active defense parameters, if yes, executing S103, and if not, executing S102; S103, controlling the camera to shoot an image corresponding to the abnormal condition, and notifying the user. According to the intelligent door lock, the external information of the lock end can be actively monitored, the corresponding image is shot and the user is notified when the abnormal condition occurs, the function and the intelligent degree of the intelligent door lock are expanded, the user can quickly know the abnormal condition when the abnormal condition occurs, the processing efficiency is improved, dangerous conditions are prevented, and the user experience is improved.