Combined high-precision hard alloy coating milling cutter

The utility model discloses a combined milling cutter with a high-precision hard alloy coating. Threaded rod, a T-shaped pipe is arranged on the outer wall of the top of the threaded rod; the inner walls of the two sides of the T-shaped pipe are fixedly provided with the same mounting disc through bolts. An installation opening of a hexagonal structure is formed in the circle center of the outer wall of the top of the installation disc. A connecting shaft of a T-shaped hexagonal structure is inserted into the inner wall of the mounting opening; a fastening nut is connected to one end of the connecting shaft in a threaded mode, rectangular openings are formed in the two sides of the outer wall of the top of the mounting disc, first pull rods are fixed to the inner walls of the two rectangular openings through bearings, and second pull rods are connected to transmission shafts of the two first pull rods in a sleeving mode. The multiple pull rods are arranged in the T-shaped pipe to be matched with the positioni