The present invention relates to a message processing and conversion device which is provided with an information security system, belonging to the electronic information security technique field. The message processing and conversion device comprises a master controller, a dynamic random access memory, an initiate memory, and the information security system provided with a security chip. The security chip is an integrated circuit chip. One side of the security chip has an interface connected with an interface of the master controller of the message processing and conversion device. The other side of the security chip has an interface connected with the initiate memory. The initiate memory is connected with the master controller only through the security chip. All the information which are interacted between the master controller and the initiate memory are gone through the security chip. The message processing and conversion device provided by the present invention has the advantages of that: any operation made for the initiate memory comprises reading and writing pass authenticate of the security chip; in addition, the security chip is an integrated circuit chip with low production cost and convenient use; and because of the security chip and Key, operations such as starting up, printing and so on are effectively monitored, so as to be in favor of managing office environment.