Abstract: To improve the detection performance of active sonar systems operating in shallow-water environments, this study investigates the spectral broadening characteristics of reverberation generated by moving sound sources in shallow seas. By incorporating the Doppler shift calculation method derived from normal mode theory into the seabed-incident sound field analysis, and employing the adiabatic normal mode theory, ray-mode analogy method, and empirical scattering law to compute the seabed-scattered sound field, a comprehensive reverberation power spectrum model capable of simulating sources moving along arbitrary trajectories is established. Through theoretical simulations and experimental data analysis, this study demonstrate that the source motion direction has minimal impact on the maximum spectral broadening range of moving-source reverberation, and the source motion direction alters the energy contribution of seabed-scattered echoes to the reverberation spectrum, consequently inducing systematic variations in the frequency-domain energy distribution patterns. The proposed model is rigorously validated using experimental reverberation data collected during at-sea trials, confirming the accuracy of both theoretical derivations and numerical simulations.