Data encryption method, system and device and storage medium

The invention discloses a data encryption method, system and device and a storage medium, and the method comprises the steps: carrying out the expansion of a preset encryption index, obtaining a large-index field pattern containing multiple digits, and dividing the digits of the large-index field pattern into a plurality of integer arrays with the length of 10 from the highest digit of the large-index field pattern. Then the integer array is shaped, a position permutation sequence composed of a plurality of position permutation groups is obtained, and the position permutation groups are completely and evenly distributed sequences. And starting from the first bit on the left side, dividing the elements of the obtained to-be-encrypted data into a plurality of to-be-encrypted groups with the length of 10, and according to a preset group corresponding relationship, performing local position replacement in the groups on the elements in the corresponding to-be-encrypted groups through the position replacement group