To solve the problem of vibration detection of double-section post porcelain insulators, this study takes 220 kV series post porcelain insulators as the research object. The SolidWorks software is utilized to model and import them into ANSYS software to set the model parameter calculation and analysis. The detection feasibility of porcelain insulators with series double-section posts by vibroacoustic is verified. Meanwhile, the influence of the vibration-picking distance and the specific location of the vibration pickup point at the bottom of the lower flange on the detection accuracy of the insulators is studied. The general rules are obtained. The achieved simulation rules are verified by building a 220 kV insulator test bench. The final conclusion shows that the excitation-pickup distance has an impact on the vibration detection results of porcelain pillar insulator. For double-section post insulators, when the excitation point and the pick-up point are on the same straight line passing through the center of the lower flange, the frequency spectrum characteristics of the signals collected by the two symmetric pick-up points on the blue center do not change with the change of the excitation pick-up distance. According to the experimental results, it is concluded that the model B03. 8-1 220 kV double-section porcelain pillar insulator is the best. The optimal excitation-the pick-up distance is 35 mm.