Embodiments of the invention provide a curvature measurement method and apparatus for a medical image. The method comprises: obtaining a track where a to-be-measured point is in the medical image; dividing the track into at least two sections; obtaining values of Mi and Mi+1 according to a three-bending-moment algorithm, wherein Mi is a second derivative of the track in a first section point, and Mi+1 is a second derivative of the track in a second section point; obtaining expressions of S'(x) and S''(x) according to the values of Mi and Mi+1; obtaining a first derivative and a second derivative of the track at the to-be-measured point according to the expressions of S'(x) and S''(x); and obtaining the curvature of the to-be-measured point according to the first derivative and the second derivative. According to the curvature measurement method and apparatus, the curvature of the to-be-measured point in the medical image can be measured more accurately, so that pathological features are reflected better.