Voltage transformer secondary harmonic elimination device detector, the device by panel and storage unit, control electrical unit, digital processing unit unit, harmonic generation unit, output switching and interface, detecting element, protected location totally seven units form. The panel contains host computer processor unit, USB interface, data storage, display screen, keyboard with storage unit, harmonic generation unit includes the DA conversion and enlargies module, power amplifier busbar voltage unit, the enlarged module of fundamental power, harmonic power amplification module. The utility model discloses can the high accuracy, troubles such as resonance, ground connection, overvoltage take place for quick, safe 35kV and the following electric wire netting of simulating, the harmonic elimination of quick test PT secondary harmonic elimination device and ground connection, overvoltage such as report an emergency and ask for help or increased vigilance at the function, the effectual traditional approach of having solved exists fragile tester, potential safety hazard, the difficult scheduling problem of test.