Abstract: In response to the problems of large size, single function, and inconvenient on-site testing of traditional power clock synchronization testers, this paper designs a handheld power clock synchronization tester based on the ZYNQ platform. The system achieves software and hardware collaborative design through ZYNQ's multi-core heterogeneous architecture: ARM0 on the PS side runs Linux system to achieve multitasking management and graphical interface development, while ARM1 uses a bare metal system to complete real-time tasks such as Beidou protocol parsing and crystal oscillator taming; the PL FPGA achieves high-precision time synchronization, multi type signal acquisition and analysis. Through practical application verification, the tester has achieved automation and transparency of substation time signal inspection, significantly improving on-site testing efficiency and accuracy, and providing reliable technical support for the safe and stable operation of the power system.