Circular diamond sawing blade

The utility model relates to a circular diamond sawing blade which comprises a substrate (1) and a cutter edge (4) and is characterized in that the combination part of the substrate (1) and the cutter edge (4) consists of two parts, namely a first part and a second part, the first part (2) is close to the main body of the substrate (1), and the second part (3) extends from the first part. By the structure of the circular diamond sawing blade, not only the combined area of a diamond working layer and the substrate can be further enhanced, but also the extending part of the metal substrate can be served as the middle layer part of the structure, thus reducing the using amount of molding materials of the diamond cutter head part. Compared with the traditional technology, the addition amount of molding materials can be reduced by 20 percent to 30 percent per cubic centimeter; and simultaneously, during cutting process, a chip removing groove is formed on the direction of saw cutting, so the working efficiency is