The invention discloses an intelligent home system, an information encryption method, an information encryption device and a terminal, and belongs to the technical field of computer application. The intelligent home system comprises the terminal, a gateway and home equipment, wherein when generating control information according to a triggered control operation, the terminal obtains a key sequencenumber sent by the gateway, selects a key from stored key sequences according to the key sequence number to obtain an encryption key, encrypts the control information, and sends the encrypted controlinformation to the gateway; and, when receiving the encrypted information sent by the terminal, the gateway selects a decryption key according to the sent key sequence number, decrypts the encryptedinformation to obtain the control information, and sends the control information to the related home equipment, so that the home equipment works according to the control information. The invention further provides the information encryption device and the terminal. By means of the intelligent home system, the information encryption method, the information encryption device and the terminal disclosed by the invention, communication security in a local area network can be ensured; and the security of controlling the home equipment through the local area network can be improved.