A high-precision time transfer method based on fiber frequency transfer is proposed to achieve higher stability of time transfer. On the premise of ensuring the uncertainty of time transfer, the proposed method can achieve the fiber time transfer with high stability and good uncertainty considering the high stability of fiber frequency transfer. On the basis of the fiber time and frequency transfer, the highly stable 1PPS (one pulse per second) time signal is regenerated using the frequency signal transmitted from the fiber frequency transfer system. Then, the regenerated 1PPS time signal tracks the 1PPS time signal transmitted by the fiber time transfer system, which renders the regenerated 1PPS time signal good stability and uncertainty simultaneously. The time transfer data measured by fiber links are used to conduct simulation experiments to verify the feasibility of the proposed method. The results indicate that under the proposed method, the fiber time transfer stability reaches 0.5 ps@1 s and 0.09 ps@10⁴ s. The experiment device for the fiber time and frequency transfer is employed to perform a test on a fiber link of 500 km, and the result demonstrates that the high-precision time transfer can be achieved by the proposed method, with the stability of 2.5 ps@1 s and 0.9 ps@10⁵ s, and the uncertainty of 6.4 ps.