A shear wave propagation speed determination method and device. The method comprises: when a shear wave propagates along a tissue region of interest, acquiring motion data of each preset position point in the tissue region of interest (step 301); determining a value of the motion data of each preset position point (step 302), wherein the magnitude of the value represents regularity of a propagation waveform of the shear wave; and if the value meets a first preset condition, determining, on the basis of the motion data of each preset position point in the tissue region of interest, a propagation speed of the shear wave at each preset position point in the tissue region of interest (step 303). The invention improves accuracy in determination of the propagation speed of a shear wave.