Coupler clamping sleeve for engraving and milling machine

The utility model relates to a coupling clamping sleeve for an engraving and milling machine, which comprises a driving shaft clamping sleeve connected with a driving shaft, a driven shaft clamping sleeve connected with a driven shaft and a metal plate spring, and the metal plate spring is positioned between the driving shaft clamping sleeve and the driven shaft clamping sleeve. The first inserting block and the second inserting block are both detachably connected with the first clamping block, and the third inserting block and the fourth inserting block are both detachably connected with the second clamping block, so that installation of the driving shaft and the driven shaft is facilitated, and working efficiency is improved. In addition, the connecting coaxiality of the driving shaft and the driven shaft is guaranteed, and the machining precision of the engraving and milling machine is improved; a driven shaft is locked through a third fixing bolt in a second locking hole, a driving shaft is locked through