Heart rate variability monitoring method and device, radar and readable storage medium

The invention provides a heart rate variability monitoring method and device, a radar and a readable storage medium. The method comprises the following steps: acquiring a heartbeat signal obtained by detecting a human body by the radar; the heartbeat signal is normalized based on the amplitude of the heartbeat signal, so that the interference of respiration on the heartbeat signal can be reduced; performing Fourier transform on the normalized heartbeat signal to obtain an amplitude spectrum of the normalized heartbeat signal, and setting the amplitude of a frequency point of which the amplitude does not meet a preset amplitude condition in the amplitude spectrum to be zero so as to eliminate interference of other frequencies; performing inverse Fourier transform on the amplitude spectrum without the frequency interference to obtain a reconstructed heartbeat time domain signal; and calculating a heart rate variability index according to the reconstructed heartbeat time domain signal, thereby improving the accu