The Train Network-side Overvoltage Identification, Inversion and Power Quality Analysis System can accurately capture overvoltages in real time during train operation. It provides data support for diagnosing faults in onboard high-voltage equipment and analyzing electromagnetic interference, as well as for insulation coordination design and full-life design of train high-voltage systems. At the same time, it features power quality analysis, power quality anomaly diagnosis (including inrush current and ferroresonance), energy consumption measurement and analysis, fault diagnosis, and alarm functions. This system plays a significant role in improving train safety and economic benefits.