Simulation technology plays an important role in the research of the entire lifecycle of data link systems. This article focused on the time synchronization requirements of the TDMA data link system virtual real joint simulation system. Based on the idea of combining hardware clock synchronization with software clock synchronization, a time synchronization scheme for the TDMA data link system virtual real joint simulation system was designed, providing a consistent time foundation for all members of the virtual real joint simulation system. And a prototype system was built in the laboratory to validate the time synchronization scheme proposed in this paper. The experimental results showed that this scheme was effective and feasible, and had advantages such as high accuracy and low cost.