The essence of current block-molding exciter, whether single frequency or modulated frequency vibration exciter, is to produce harmonic periodic vibration simply, leading to the problems such as the instability of block compactness and the long cycle of production. Based on chaotic vibration, this thesis proposes a block-molding exciter characteristic of wide frequency which can produce wider vibration frequency than periodic vibration and help to vibrating compaction positively. In this paper, it designed a chaotic vibration exciter based on chaotic vibration and established its mechanics model. Through simulation identification, it turns out that the dynamic response is chaotic vibration. In order to make material in concrete get more sufficient energy, it propose bidirectional vibration pressure technology based on traditional technology. Through numerical simulation and experiment research show that the new block-molding technology based on the chaotic vibration technology can improve block compactness obviously and strengthen block compressive strength significantly.