The invention discloses an IMA processor system information security management method, comprising following steps: 1), information security management total method: 1.1), dividing IMA processor system information into four security levels of top secret, confidential, secret and ordinary information, managing the information; setting the security level of the top secret information to be highest, setting the security level of the ordinary information to be lowest; 1.2), storing the secret and ordinary information in a processor system, forbidding storing the top secret and confidential information in the processor system, only temporarily loading the top secret and confidential information through a data loader; 1.3), identifying and encrypting the top secret, confidential and secret information according to the levels; 1.4), carrying out information access authority management and control according to corresponding security levels. According to the IMA processor system information security management method provided by the invention, the information using authority is effectively managed; the information transmission flow direction is controlled; and the information security storage access problem of the IMA processor system resulted from high resource sharing and high data fusion is solved.