The invention provides a vibrator assembly of a centering structure, which comprises a flat plate assembly and a heavy hammer assembly, a hammer body of the heavy hammer assembly is connected with the flat plate assembly through an elastic connecting piece, and the two ends of a piston rod of the heavy hammer assembly are fixedly connected with the flat plate assembly through end covers; the elastic connecting piece comprises a centering spring, a centering spring seat and a centering spring seat limiting seat, a centering spring mounting hole is formed in the hammer body, and the centering spring is in close fit with the centering spring mounting hole of the hammer body through tolerance fit. Due to the closed box type structural design, the vibrator assembly has high torsion resistance and sufficient rigidity, the overall performance of the vibrator assembly is more stable, meanwhile, space is saved, the length and width of the whole vehicle are greatly reduced, and the vibrator assembly is beneficial to exploration in cities and towns. The mechanical structure is more stable and firmer, and compared with an air bag, the wear resistance is longer, and the service life is longer.