This invention belongs to the field of tunnel and underground engineering technology, specifically relates to a shield tunnel settlement control method based on ground penetrating radar. The dynamic cyclic feedback method is used for shield tunnel settlement control, with the specific steps being: using ground penetrating radar equipment to conduct full-section and longitudinal detection of grouting behind the shield tunnel wall, then determining or estimating the dielectric constant of the grouting material, and applying it to model test detection, forward modeling results, and field detection data of the grouting layer behind the tunnel wall. Extracting characteristic images and waveforms, using them as training input samples, and employing a wavelet neural network automatic recognition method to obtain the distribution morphology of the grouting layer behind the shield tunnel wall; combining surface settlement monitoring data for analysis. Based on the above analysis results, determine the next step in construction control measures. To verify the effectiveness of the control measures, it is necessary to conduct another field detection, forming a cyclic dynamic process. To achieve complete and effective control of the uneven settlement deformation of shield tunnels. This invention solves the problem of grouting behind the wall very well, making the method of controlling the settlement of shield tunnels more scientific.