Medical information encryption method and device and storage medium

The invention discloses a medical information encryption method and device and a storage medium, and relates to the technical field of information encryption. The method comprises the following steps: converting a medical information document into a grayscale image; carrying out gray scale transformation operation on the gray scale value of each pixel point in the gray scale image to obtain the gray scale transformation value of each pixel point; searching a sample grayscale image, and carrying out difference operation on the grayscale transformation value corresponding to each pixel point and the grayscale value of the pixel point in the sample grayscale image to obtain a first grayscale difference value of each pixel point; after the first gray difference value of each pixel point is converted into a binary code, carrying out XOR operation on the binary code and a key extracted based on user basic information to obtain a second gray difference value of each pixel point; and generating an encrypted image cor