Shell mounting structure of sewing machine cutter

The utility model relates to a shell mounting structure of a sewing machine cutter, which comprises a machine head, a machine base, a cross beam and a movable rod of the cutter, a notch is arranged on the back side of the cross beam, an internal driving structure of a shell is connected with a cutter linkage structure through the notch, a protective cover is arranged on the outer side of the notch, and driving shaft holes are arranged on the left side and the right side of the protective cover. The direction of the driving shaft hole is parallel to the length direction of the shell, a supporting base is arranged at the lower bottom of the machine head, the movable rod is installed on the supporting base and can rotate along the supporting base, the corresponding notch and the shell are arranged, the driving rod and the connecting part of the internal driving structure and the cutter linkage structure are protected, foreign matter is prevented from falling into the shell, and the cutting efficiency is improved