The electronic ear tag is an electronic device dedicated to animal identification and electronic management. It is an electronic identification card for animals that can be automatically identified. People can easily automatically identify each individual animal through various types of dedicated readers. In this way, many animal research, breeding, management, investigations, such as individual identification, data statistics, whereabouts control, automatic breeding, behavior management, etc., have automated and informatized technical means, and the ability to track and manage animals will greatly improved.