The invention provides a depth domain layer speed correcting method suitable for an undulating surface, belonging to the field of the seismic data processing of the physical prospection in the petroleum geochemistry. The method comprises the following steps of: firstly, segmenting an offset distance, grouping input trace gathers according to the offset distances, carrying out the undulating surface prestack depth migration, and generating a common imaging point trace gather; carrying out undulating surface residual speed analysis, computing a high-order residual curvature spectrum, picking up a depth-residual curvature pair according to the local maximum value of the high-order residual curvature spectrum, and obtaining speed model correction quantity; carrying out spatial interpolation and smoothness on the speed model correction quantity, and adding the speed model correction quantity with an initial speed model to obtain an updated undulating surface depth domain layer speed model; and replacing the initial speed model with the updated undulating surface depth domain layer speed model, and carrying out the analysis of undulating surface prestack depth migration and the undulating surface residual speed once again, so that the precision of the speed model can be continuously improved.