Self-centering inner-cooling diamond micro drill and machining method thereof

The invention relates to a self-centering inner-cooling diamond micro drill and a machining method thereof, and relates to the technical field of PCD tools. The self-centering inner-cooling diamond micro drill comprises a drill bit, and the drill bit comprises a first centering face, a second centering face, a third centering face and a fourth centering face which are sequentially connected and spliced to form a drill tip micro arc. The included angle between the first centering surface and the third centering surface is 130 degrees, and the included angle between the second centering surface and the fourth centering surface is 130 degrees; two of the four main blades are connected into a whole, and the other two main blades are connected into a whole; the first supporting surface is connected with the first centering surface and the second centering surface, and the main blade is located on one side edge of the first supporting surface; the second supporting face is connected with the third centering face an