Data encryption and decryption system and data encryption and decryption method

The embodiment of the invention discloses a data encryption and decryption system and a data encryption and decryption method, and the data encryption and decryption system comprises a password calculation module which is used for receiving a target request of target equipment for encrypting and decrypting target data, and receiving an encryption and decryption result of the target data; the key management module is used for determining a data type of the target data according to the target request and determining a target key of the target data from the distributed database according to the data type; the distributed database is used for storing the encryption and decryption key set by the key management module; and the encryption and decryption module is used for calling the encryption equipment to encrypt and decrypt the target data according to the target key and acquiring an encryption and decryption result from the encryption equipment, and the encryption and decryption module is connected with the encr