The embodiment of the invention discloses a blood vessel extraction method and device and a computer readable storage medium, and the method comprises the steps of obtaining N layers of slice images of a target blood vessel, wherein each layer of slice image comprises velocity field images in M directions, and N and M are positive integers; based on an image preprocessing algorithm, preprocessingeach layer of slice image in the N layers of slice images to obtain a first type of N layers of images, wherein the image preprocessing algorithm comprises at least one neighborhood processing algorithm; segmenting a target area containing the target blood vessel from each layer of image in the first type of N-layer images based on a preset image segmentation algorithm to obtain a second type of N-layer images; and combining the second type of N-layer images based on the image sequence of the N-layer slice images to obtain an initial three-dimensional point cloud model of the target blood vessel.