1. A constructing method for visualization models of human peripheral nerve fascicles, comprising the steps of: obtaining human peripheral nerves, and treating the peripheral nerves by staining with an iodine preparation in combination with a freeze-drying method; scanning the pretreated peripheral nerves by using Micro CT to acquire lossless two-dimensional images, and performing binarization processing of the two-dimensional images, then conducting image segmentation based on textural features to acquire images of nerve fascicles; reconstructing the images of nerve fascicles into visualization models.