Provided is a biometric data monitoring platform using a biometric signal sensing ring. The platform includes a server, wherein the server includes a signal quality classification system including a first signal quality classification component configured to classify signal quality of a first wavelength photoplethysmography (PPG) signal as being good or bad, a biometric data calculation system including an atrial fibrillation determination component configured to determine whether atrial fibrillation has occurred, from the first wavelength PPG signal by using a deep learning model, and a biometric index calculation system including an atrial fibrillation index calculation component configured to calculate an atrial fibrillation index from a first signal quality classification result generated by the first signal quality classification component and an atrial fibrillation determination result generated by the atrial fibrillation determination component.