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At present, power quality devices generally use DSP as the computing core. As power quality indicators gradually increase, their computing power becomes more and more unsatisfactory, and they can only monitor user harmonics, and cannot control users with harmonics exceeding the standard. The real-time dynamic harmonic monitoring device designed by the 104 industrial control board hardware platform realizes the calculation of large data volume of power quality indicators and the early warning and control of harmonic exceeding standards. The FPGA is responsible for frequency tracking, data acquisition, and PCI data communication. 104 industrial control board is responsible for the calculation of power quality indicators, data storage, protocol conversion and human-computer interaction. The software adopts the adaptive time domain equalization harmonic signal processing method, which improves the harmonic measurement accuracy and stability, and reduces the error caused by the jitter and deviation of the sampling frequency. Through the testing and application of 28 substations in Xingtai Power Supply Company, the effective monitoring of harmonics of harmonic source users is realized, and the enthusiasm of active harmonic control of harmonic source users is promoted, and good results are obtained.