Master-slave clock synchronization method and system

The present invention provides a master-slave clock synchronization method and system, the master clock sends the first message to the slave clock, the slave clock feeds back the second message to the master clock, and records the time t when the first message leaves the master clock during this process ₁ , the time t when the slave clock receives the first message ₂ , the second message leaves the slave clock time t ₃ and the time t when the master clock receives the second message ₄ , calculate the path delay and clock skew between the master clock and the slave clock based on these recorded times, perform exponential smoothing on the path delay and clock skew, and synchronize the master clock and the slave clock according to the processing results. During the whole process, the path delay and clock offset between the master and slave clocks are calculated, and the path delay and clock offset results are optimized by exponential smoothing processing. The optimized data is more in line with the real situation and has adaptability, and can automatically adjust Time and frequency modulation to achieve high-precision master-slave clock synchronization.