The machine adopts the connecting rod type feeding structure, which has good durability and balanced feeding. For the bulk-type sewing material and the medium-thickness sewing material with large submergence, the feeding amount of the upper and lower layers can be consistent during the sewing process. The built-in integrated computer control technology provides stable performance and strong anti-interference ability. The operating space can reach 335mm wide and 1 50mm high. The use of a large rotary hook reduces the number of bottom line changes and improves work efficiency: the use of fully automatic lubrication devices improves the service life of the machine. With optional voice broadcast, USB socket, new double action knife timming structure, sealed bottom oil pan, automatic needle position, automatic needle number, automatic counting needle stitch, electronic clip line, built-in automatic presser foot A variety of smart sewing modes. Suitable for sewing medium and thick materials, bags, leather, leather products, sofas, etc.