This application provides a method, and a device for abnormality detection of an optical access device, and a storage medium. The method includes: obtaining an offline situation of at least one optical access device within a preset time period; indicating, in response to the offline situation satisfying a preset detection condition, one or more in-service first optical access devices in the optical access device to suspend a registration process within K time windows; collecting optical signal strength within the K time windows respectively to obtain K signal strength values, where the K time windows one-to-one correspond to the K signal strength values; and determining, based on the K signal strength values, whether an abnormal optical access device