Abstract: Vibration grouting refers to the application of vibration excitation to the saturated sand layer so that the effective stress is reduced and the strength is reduced after the disturbance, thereby reducing the diffusion resistance of the slurry, increasing the diffusion range of the slurry, and improving the grouting efficiency and reinforcement effect. Currently, vibration grouting tests predominantly utilize the axial vibration mode, wherein vibrational energy is focused at the end of the drill pipe, which has almost no disturbance effect on the radial soil, and the influence range is limited. To address this limitation, a new vibration grouting test system equipped with radial excitation capabilities and an adjustable frequency has been developed. This system features a cylindrical vibration source at the end of the grouting rod, connected to the rod via a vibration isolation device. This arrangement minimizes the transmission of vibrational energy along the rod, thereby maximizing its impact on the surrounding soil and enhancing energy utilization. This device was employed to conduct vibration grouting tests under various excitation conditions, analyzing the impact of vibration frequency and burial depth of the grout hole on the diffusion performance of geopolymer grout in saturated sand. The results show that under the condition of constant upper limit grouting pressure, the length of the consolidated grout body remains consistent rent conditions, while its width increases significantly with increased vibration frequency. In comparison to static grouting, the application of 10 Hz, 30 Hz, and 50 Hz vibrations resulted in width increases of 80% 113%, and 187%, respectively. With the increase of the depth of the grout outlet, the width of the consolidation body decreases gradually. Additionally, grouting pressure increases progressively from slow to rapid, and then sharply over time. As vibration frequency increases, the rate of grouting pressure increases in each stage decreases, while both the grouting duration and total grouting volume increase. Conversely, the impact of the burial depth of the outlet hole on these metrics is the opposite. At various times, the additional earth pressure at each measurement point increases with higher vibration frequencies and decreases with deeper burial of the grout outlet hole. The highest additional earth pressure is observed horizontally nearest to the grout outlet hole, while vertically, the lower measurement points experience less pressure than the corresponding upper points. The test conclusion provides a foundational reference for further exploration into the mechanisms of vibration grouting.