The catenary abrator suitable for small pieces of cast iron, steel castings, forgings and stampings shot blasting, particularly suitable for forging, casting cleaning to remove the sticky sand on the surface, rust, oxidation leather dirt, so that the workpiece surface showing a metal color, eliminate internal stress and improve fatigue resistance, increase workpiece paint film adhesion, and achieve the purpose of workpiece surface and internal quality. Improve the fatigue performance of mechanical products and metal profiles of anti-corrosion and steel and prolong life. Optimize the process of steel surface condition, and achieve the purpose of fully cleaned up.