The utility model discloses a connecting structure of a thin kerf diamond bit and a cover plate, comprising the connection between a sleeve of the cover plate and a steel pipe of the thin kerf diamond bit, wherein the steel pipe and the sleeve are connected through a pipe thread and a hole thread which are mutually matched; the pipe thread is arranged on the outer circumference of the sleeve; the hole thread is arranged on an inner hole of the steel pipe; the rotating directions of an internal thread and an external thread are same as the rotating direction of the working thin kerf diamond bit; and the sleeve at the tail end of the external thread is provided with a locating step for screwing in the steel pipe in place. Compared with the prior art, the connecting structure has the advantages that the torsional force borne by the steel pipe is uniformly distributed within the circumference range of the steel pipe and the sleeve through a screw thread, a connection part is not easy to break and free of secondary machining, no organizations difficult to machine, such as a welding seam are generated, the appearance of a product is attractive, the welding process is omitted, the production process is shortened, the production cost is reduced, and the production efficiency is increased.