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Time synchronization has a crucial impact on devices and management in power system. How to synchronize power grid time precisely is a difficult problem. To solve the problem, a time synchronization method based on time traceability using satellite common-view was proposed. Firstly, a four-layer time tracing system was put forward. Secondly, a time-frequency measurement standard device with satellite common view function was established. Then, the satellite common view technology was used in power system, and Kalman filter was adapted to decrease noises. The common view result showed that the time-frequency measurement standard device was stable and the proposed method was able to realize time traceability and synchronization. Ultimately, the uncertainty of time and frequency traceability using the proposed method was analyzed. The analysis showed that the proposed method can precisely disseminate the time value and effectively synchronize time in power system.