Due to the good drag reduction effect of the traveling wave structure on the surface of structured fish scales, it is of great significance to prepare structured fish scale surfaces on hard and brittle materials. In order to prepare structured fish scale surfaces on brittle and difficult-to-process materials, the topological features of fish scale surfaces are first extracted, and a surface model of fish scale units is established. The fish scale model is then used to construct the structured fish scale surface. Next, based on the principle of micro-abrasive air jet processing, the feasibility of air jet processing for topological fish scale experiments and the important process parameters affecting the morphology of the structured fish scale surface are analyzed. Finally, using the single-factor experimental method, the important processing parameters are experimentally analyzed to obtain a better topological fish scale surface unit, and the structured surface is arranged accordingly. The research results show that using micro-abrasive air jet processing, it is possible to process structured topological fish scale surfaces on hard and brittle materials. Different process parameters will change the surface morphology of the processed material, but the topological properties of the fish scale surface remain unchanged.