Electronic archive sharing method and system based on block chain

The invention provides an electronic archive sharing method and system based on a block chain, and belongs to the technical field of computers, and the method specifically comprises the steps: judging whether the security level of an archive belongs to confidential or top secret, if yes, encrypting the archive by adopting an encryption mode based on the block chain, and if not, carrying out encryption on the archive by adopting an encryption mode based on the block chain; if yes, it is judged that the security level of the archive belongs to a secret, only when the type of the archive belongs to a specified type, the archive is encrypted in an encryption mode based on a block chain, and when the secret of the archive belongs to the secret but the type does not belong to the specified type, the archive is encrypted through a one-way HASH algorithm; and if the file does not belong to the secret, judging whether the type of the file belongs to a specified type, if so, determining an encryption mode of the file a