Key value data directional sharing method, device and system based on block chain technology and storage medium

The invention discloses a key value data directional sharing method, device and system based on a block chain technology and a storage medium, and the method comprises the steps: encrypting a value value of a to-be-shared key value pair according to a preset encryption algorithm, and obtaining first encrypted data; then, acquiring an identity label and a public key of a to-be-shared object, and performing asymmetric encryption on the encryption key of the first encrypted data by using the public key of the to-be-shared object to obtain second encrypted data; and finally, storing the key value of the to-be-shared key value pair, the identity identifier of the to-be-shared object, the first encrypted data and the second encrypted data in a block chain network, and taking the key value of the key value pair and the identity identifier of the to-be-shared object as indexes for obtaining the first encrypted data and the second encrypted data from the block chain. Therefore, the encryption data can be obtained through the identity label of the to-be-shared object and the public key value, and decryption is performed through the private key of the to-be-shared object, so that directional sharing data is obtained.