The invention discloses a breath and heartbeat real-time separating method based on biological radar detection. Breath and heartbeat signals can be separated from body moving signals in real time after the breath and body moving signals which are detected by a biological radar are pre-processed, harmonic wave of the breath signals is detected, self-adaptive harmonic wave is counteracted and the like, non-contacting and real-time detection on the breath and heartbeat signals are achieved and thereby requirements of biological signal real-time monitoring on clinical patients (burning or infection), senior person in families and other patients of chronic diseases are met.