Adjustable rough and fine machining facing cutter

The utility model relates to an adjustable rough and fine machining facing cutter which comprises a cutter body, blades and a fine adjusting mechanism. An opening key groove is arranged on a small end face of the cutter body and is used for being connected with a cutter handle, at least three step grooves are arranged on a large end face of the cutter body, the blades are fixedly connected onto step groove walls, each blade is a fix-face sheet body, one of lateral faces is perpendicular to a blade face, the other three lateral faces form an included angle of 6 degrees to 15 degrees with a belt sheet face, the blades are made of poly crystal diamond (PCD), facing cutter cooling holes are arranged at the bottom of the opening key groove, distribution holes communicated with the cooling holes are arranged on the step groove walls, and the distribution holes are lead to the blades. The fine adjusting mechanism comprises a radial adjusting mechanism arranged on the step groove walls and axial adjusting blocks arra