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Aiming at the problem of harmonic interference caused by the wide use of wind power generation and photovoltaic power generation, this paper studies the detection and evaluation scheme of harmonic interference of electrical equipment, and designs the harmonic detection system of electrical equipment, which includes six parts: main control circuit, voltage sampling circuit, waveform conversion circuit, synchronous phase-locked frequency multiplier circuit, a / D conversion circuit and liquid crystal display circuit. The functions of signal acquisition, waveform conversion, frequency doubling and signal display are realized. In addition, the improved DFT and time-domain quasi synchronous algorithm are used to detect the harmonics of electrical equipment, so as to achieve accurate and stable detection of harmonics. In addition, the method of harmonic evaluation of electrical equipment is also studied, and the non intervention estimation method is used to evaluate the harmonic of electrical equipment, so as to realize the harmonic evaluation of electrical equipment without affecting the load operation. In order to verify the superiority of this study, a large number of experiments have been done. The experiments show that the harmonic detection error of electrical equipment in this study is within the range, with high accuracy and stability.