To address the issue of autonomous time synchronization of Tactical Data Link (TDL) under the condition of limited resources, a time-difference data processing algorithm based on Kalman filter and an adaptive RTT message transmission strategy were designed, which effectively reduced the resource consumption rate of RTT messages.In addition, a corresponding solution was proposed for the problem of Kalman filter divergence caused by NTR role transfer, which ensured the stability of the time synchronization function.The experiment and simulation results have proved the effectiveness of the proposed method.