To maintain efficient traffic flow and flight safety, an internationally standardized air traffic management system (ATM) controls every aircraft operating in the restricted area. Nonetheless, there is a growing and increasingly complicated interchange of information between controllers and pilots. The demands of high-quality, high-capacity, and high-speed aircraft communication may be met by using digital data transmission, but it is impossible to overlook the concealed security issue. Deceiving attackers can silently affect the normal flight of aircraft by invading communication systems. This paper proposes an aviation security communication method based on SM4 encryption algorithm, which establishes a secure data exchange communication channel between the aircraft and the corresponding ground station after the aircraft enters the community. The experimental results show that compared with the traditional communication scheme, this scheme not only has faster message processing speed, stronger message confidentiality, but also has certain resistance to common network attacks.