The invention discloses a Doppler parameter real-time automatic marking method. The Doppler parameter real-time automatic marking method includes the following steps that maximum value filtering is carried out on all envelope points of an envelope curve; an envelope point when the envelope curve goes upwards is searched for and the envelope point serves as the initial point of the current monotonically rising interval and is recorded; when an envelope point when the envelope curves drops is found, the envelope point serves the terminal point of the current monotonically rising interval and is recorded; the current monotonically rising interval is judged and the envelope peak point of the envelope curve is found out. The Doppler parameter real-time automatic marking method can mark the flow velocity envelope curve peak value more rapidly and more accurately, disturbance of noise waves with large amplitude can be avoided and real-time measurement is facilitated.