A method and a smart watch for detecting and prompting abnormal heart rate data, and the start watch comprises a main processor and an auxiliary processor. When the main processor is in a dormancy state, the auxiliary processor collects heart rate data and analyzes whether the heart rate data is abnormal. When it is determined that the heart rate data is abnormal, the auxiliary processor is interrupted and the main processor is woken up, and the abnormal data is submitted to the main processor for processing. When the processing is completed, the main processor returns to the dormancy state, so that the main processor does not need to participate in the heart rate data collection and analysis process. The power consumption during running of the auxiliary processor is one quarter of the power consumption of the main processor in the dormancy state.
