The invention discloses a method for evaluating the stability of slurry, which comprises the steps: the back scattering intensity of the slurry is measured; the slurry is centrifugated, and the back scattering intensity of the slurry after centrifugation is measured; and the change rate of back scattering intensity of the slurry before and after centrifugation is utilized to evaluate the stability of the slurry. As the slurry has certain viscosity, observation of the change of the slurry after standing needs long time. By utilizing a centrifugal method, the method can accelerate the settlement process of the slurry, thus shortening the test time. In addition, the method can accurately evaluate the stability of the slurry by utilizing the change rate of the slurry before and after centrifugation.