The invention discloses a secure tight coupling memory, an access method thereof and a storage medium. The secure tight coupling memory is connected with the processor; a plurality of storage areas with different security levels are preset in the secure tight coupling memory; each storage area is used for storing data corresponding to the security level of the storage area; the access method comprises the following steps: access operation information is received, the access operation information comprises a data address in a storage area and a security attribute identifier of the access operation information, and whether the access operation information has the authority to access the data address or not is judged according to the security attribute identifier of the access operation information and the data address; and if the data address has the authority to access the data address, access operation is perforemd on the storage area corresponding to the data address. According to thesecure tight coupling memory, the access method thereof and the storage medium provided by the invention, the requirements on storage program and data security in a secure and trusted processor architecture are met.