Block chain-based data storage method, device and equipment and storage medium

The invention relates to the field of block chain storage, and discloses a block chain-based data storage method, device and equipment, and a storage medium. The method comprises the following steps:reading first storage data of a main node server in a block chain local area network, and obtaining access permission setting of each child node server corresponding to the first storage data in the block chain local area network; generating an access permission matrix based on a preset matrix generation rule according to all access permission settings; generating second storage data based on a preset data correction rule according to the access permission matrix and the first storage data; updating the database of each sub-node server with the second storage data to obtain a corrected sub-node database corresponding to each sub-node server; and closing the data access link of each sub-node server in the main node server, and confirming all the corrected sub-node databases as databases fordata access of the corres