Adopting a new type of double pivot reverse sewing mechanism, it has the characteristic of anti-wear, and can still maintain precise reverse sewing after long-term use. The new stitch mechanism not only has precise settings, but also allows for easy adjustment of the stitch size for forward and reverse stitching, while the reverse stitching device is easy to operate. Adopting a comprehensive feeding method, the feeding is strong, durable, and balanced. For bulky and medium thick sewing materials with high mobility, the feeding amount of the upper and lower layers can be consistent during the sewing process. The use of built-in servo motors directly drives the machine, achieving fast start-up and precise braking; At the same time, advanced integrated computer control technology is adopted, with stable performance and strong anti-interference ability. Using a large rotary shuttle to reduce the number of bottom line changes and improve work efficiency; Adopting a fully automatic lubrication device to improve the service life of the machine. It has multiple intelligent sewing modes such as automatic needle positioning, automatic needle counting, automatic counting reverse sewing, automatic thread cutting, electronic thread clamping, and automatic foot lifting. Suitable for sewing medium thick materials, bags, leather jackets, leather products, etc.