With the development of 5G and 6G communication, satellite communication, which can provide the global seamless coverage capability, has become an indispensable and important role. In view of the open channel characteristics of satellite communication, the security of satellite communication has been paid more and more attention, especially the demand for satellite secure communication in national defense and military communication. Based on the architecture of the Multi-Satellite and Terminal Multi-Antenna (MS-TMA) satellite communication system, from the physical layer of security and covert communication theory, it puts forward a satellite covert communication strategy, and the covert communication performance theory analysis and simulation, the research outcomes have significant reference value for the advancement of satellite secure communication theory and the development of its applications.