The invention provides an ear tag for cattle. The ear tag at least comprises a wearable part and a tag part, wherein the ear tag is installed on a cattle ear by the wearable part; the tag part is used for distinguishing and monitoring the cattle; the tag part at least comprises a tag element, a satellite positioning module, a communication module, a temperature module, a heart rate sensor module, a double motion sensor module, a microcontroller and a powder module, wherein the satellite positioning module, the communication module, the temperature module, the heart rate sensor module, the double motion sensor module are respectively in data connection with the microcontroller; the powder module is respectively electrically connected with the satellite positioning module, the communication module, the temperature module, the heart rate sensor module, the double motion sensor module and the microcontroller and can supply electric energy. Compared with the existing technology, the ear tag for the cattle can effectively improve the existing grazing pattern, guarantee the healthy growth of the cattle, and realize the intelligent grazing.