Shaft coupler special for main shaft of machine tool

The utility model discloses a shaft coupler special for a main shaft of a machine tool. The shaft coupler special for the main shaft of the machine tool comprises a left ring flange, a right ring flange, a left flange sleeve and a right flange sleeve and a plate spring set arranged between the left ring flange and the right ring flange, wherein the left ring flange, the right ring flange, the left flange sleeve, the right flange sleeve and the plate spring set are arranged coaxially. Adjacent sides of the left ring flange and the right ring flange are respectively protrude inward to form a left convex ring and a right convex ring, a predetermined gap is reserved between the left convex ring and the right convex ring, and the plate spring set is contained between the left convex ring and the right convex ring. Due to the fact that the plate spring set is arranged between the left convex ring and the right convex ring, when the plate spring set cracks as the service life is expired, the plate spring set can not