The invention relates to the field of laser processing, and in particular relates to a laser shock reinforcing method for obtaining large area uniform surface morphology; by use of the plastic deformation relationship between absorption layer thickness and laser shock reinforcing and cooperation of a grid absorption layer with interlaced thickness distribution and a two-layer interleaved laser shock processing method, the height difference of micro bulge and micro pit produced by square light spot shocks can be significantly reduced, and the workpiece surface roughness can be effectively reduced, so that the large area uniform surface morphology can be formed on the workpiece surface.