Data storage method, system and device and readable storage medium

The invention discloses a data storage method. The method comprises the steps of determining to-be-stored data according to an input data storage request; performing primary encryption on the to-be-stored data by using a first preset key, and transmitting the obtained encrypted data to a virtual encrypted disk; and controlling the virtual encryption disk to perform secondary encryption on the encrypted data by using a second preset key, and storing the obtained ciphertext data in the physical disk. By setting the virtual encryption disk, the virtual encryption disk is controlled to carry out secondary encryption on the encrypted data by using the second preset key after the first preset key is used for carrying out primary encryption on the to-be-stored data, and finally, the obtained ciphertext data is stored in the physical disk; therefore, the data stored in the physical disk is ciphertext data obtained after two times of encryption, and the security of data storage is greatly improved. The invention also provides a data storage system and device, and a readable storage medium, which have the above beneficial effects.