In the power system, abnormal operation of time synchronization devices may lead to significant deviation between monitoring accuracy and actual situation, thereby affecting the overall monitoring effect. To address this issue, this article proposes the research and implementation of time synchronization device monitoring and evaluation technology based on power system network communication security. This method achieves monitoring and evaluation of power system time synchronization devices by designing hardware and software modules. In terms of hardware design, this article proposes key modules such as system authorization module, parameter management module, management unit module, and main clock monitoring hardware module. These modules work together to provide comprehensive monitoring and management capabilities for time synchronization devices. At the same time, based on the main clock monitoring hardware module, the system software part was further designed to collect time information parameters of the power system at regular intervals, and to timely identify device faults through anomaly recognition software. In addition, based on the identification results, combined with the device self check program, query program, communication interface program, and cyclic display program, the monitoring function of time synchronization for power secondary equipment is achieved. In terms of communication security, this method combines encryption algorithms and security authentication mechanisms to ensure the confidentiality and integrity of the communication process of the time synchronization device. By using encryption algorithms to encrypt the transmitted data and using security authentication mechanisms to verify the identities of both communication parties, while protecting the data, unauthorized access and attacks are prevented. The experimental results show that the accuracy deviation monitored by this method does not differ by more than 1 millisecond from the actual deviation, and the evaluation results are consistent with the actual results. This proves that the proposed method has strong real-time performance and stability. At the same time, combining appropriate communication security measures can ensure the data security and integrity of the time synchronization device during the communication process.