Abstract: In order to improve the clarity of ECG waveforms and the anti-interference ability of ECG acquisition under abnormal conditions, this study proposes a high-definition ECG recording method based on superimposed averaging algorithm. The results show that the proposed method can more clearly reflect the details of the ECG. Meanwhile, it has a significant inhibitory effect on EMG interference. As a result, the proposed method has a positive significance for improving the anti-interference ability of ECG equipment.