Sleep staging method, system and device based on ballistocardiogram signal and medium

The invention discloses a sleep staging method, system and device based on a ballistocardiogram signal and a medium. The method comprises the following steps: collecting a first ballistocardiogram signal of a human body; acquiring a first heartbeat signal and a first respiration signal according to the first heart impact signal; acquiring a first heart rate variability and a first cardiopulmonary coupling power spectrogram according to the first heartbeat signal and the first respiration signal; inputting the first heart rate variability and the first cardiopulmonary coupling power spectrogram into a sleep staging model for feature extraction, performing sleep staging according to extracted features, and outputting a staging result; wherein the sleep staging model is obtained by training by adopting electrocardiosignals and then adjusting by adopting ballistocardiogram signals on the basis of transfer learning. The sleep staging is realized through the ballistocardiogram signal, and since the ballistocardiogr