Being limited by the accuracy of the atomic clock process and radio signal measurement, it’s difficult to achieve high-precision time synchronization between Roland C stations. Based on the quantum entangled microwave signal and cavity electro-opto-mechanical system, the more accurate synchronized time difference information of Roland C main and auxiliary stations can be obtained by converting the microwave quantum signal into the optical frequency domain for coincidence detection. Through theoretical analysis and simulation, the conditions of microwave and optical conversion in the cavity, as well as the effect of cavity dissipation on the fidelity are obtained. The optimal phase sensitivity detection can be realized by controlling the driving field parameters of the cavity, and the precision level can reach the picosecond level. Compared with the original synchronization method, this scheme can effectively improve the time measurement accuracy, without using expensive atomic clock and measuring the pulse arrival time.