Using the discrete element method (DEM), a series of numerical simulations of elastic wave propagation are carried out on the particle models of pure soil foundation and soil foundation containing a single-layered soilbag. The influence of the soilbag in the foundation on the elastic wave velocity and the damping of foundation is studied. Numerical simulation results show that the existence of soilbag in the foundation slightly reduces the elastic wave velocity and reduces the quality factor Q of the foundation. The change laws of elastic P-wave velocity and S-wave velocity are roughly the same when they pass through the soilbag. Under the condition of 100.kPa confining pressure and 500.Hz elastic wave input, the attenuation effect of a soilbag on the elastic wave is mainly concentrated when passing through the upper and lower geosynthetic interface.