Multi-block structure grid data compression and storage method and device and multi-block structure grid data decompression method and device

The invention discloses a multi-block structure grid data compression and storage method. The method comprises the following steps: extracting block information and grid geometric data of a pluralityof block structure grids; outputting the number nblocknum of the grid blocks to a file; extracting logic surface information and logic surface geometric data of six logic surfaces of a single grid block; sequentially outputting the logic surface information and the logic surface geometric data of the six logic surfaces of the single grid block to a compressed file, and completing output of the logic surface information and the logic surface geometric data of the single grid block; and completing output of logic surface information and logic surface geometric data of all grid blocks of the plurality of structural grids, and generating a compressed storage file of the plurality of structural grids. According to the method, the logic surface information and the logic surface geometric data ofthe single-block structur