The utility model discloses an acoustic vibration detection test assisting device for 750kV post porcelain insulators. The acoustic vibration detection test assisting device comprises a general support base and a steel coupling disk, wherein the general support base is capable of adjusting the bottom support area; the steel coupling disk is used for connecting insulators with different diameters; eight oblong mounting holes are formed in an upper insulator fixing plate of the general support base and are used for fixing the insulators with different diameters; six steel coupling disks can realize rigid connection when the insulators with different diameters are combined in different orders and directions; and transmission of acoustic vibration detection signals among the insulators is ensured. By virtue of the assisting device, acoustic vibration detection test is carried out on multiple sections of serially connected post porcelain insulators by simulating the field installation condition. The simulated detection test on artificial defects of different positions of the serially connected insulators is carried out by virtue of four porcelain insulator material object samples; the influence rule of the defect positions on detected data is found out; and the target of obtaining the most test data with samples as less as possible is reached.