Method for increasing surface roughness of man-made diamond single crystal

The invention discloses a method for increasing surface roughness of a man-made diamond single crystal. The method comprises the following steps: packaging a diamond with oxalate, putting the packaged diamond in a reducing atmosphere, heating and sintering, pickling, washing and drying sintering products, thereby obtaining diamond with improved surface roughness. The method is used for processing the diamond surface, so that the uniformly-distributed corrosion morphology is shown in the surface, the surface roughness of the diamond is increased, the specific surface area and the surface energy of the diamond are improved, the mechanical holding force of a binder in a diamond tool on the diamond surface is strengthened, the condition that the diamond is easy to separate in a practical grinding process is improved, and the service life of the diamond tool is prolonged. The method has the advantages of being low in equipment requirement, simple in operation process, economical and practical, obvious in effect, and the like.