Diamond bit capable of positioning

The utility model relates to the field of drilling tool technology, and particularly relates to a diamond bit capable of positioning, comprising a diamond cutter head and a circular tube metal base body, one end of the metal base body is connected with the diamond cutter head, and the other end is in the structure of seal, the diamond bit is characterized in that: the internal of the metal base body is provided with a positioning bit, one end of the positioning bit is connected at the central position of the seal end of the metal base body, and the other end extends to the external side of the diamond cutter head. According to the diamond bit provided in the utility model, in the work process of drilling, cutting of a positioning loop by the bit in advance at the periphery of a hole needed to be drilled is not needed, preventing deviation of the high-speed rotation cutter head from a marble in contact, and safety hidden trouble of the flying cutter head; when drilling is completed, waste materials in the internal of the bit can be easily removed. Also, force bearing of the diamond cutter head in drilling operation is more uniform, and service lifetime of the diamond bit is improved to the greatest extent.