The high-quality flat seam (tight seam) with delicate texture and soft texture for the skin is not only a slim underwear, but also widely corresponds to the design of outerwear. Improvements have been made to the mechanisms of the needle winding machine, disperser, lower bending needle machine, and needle guard, so that they can adapt to all types of sutures. We have further achieved more stable and aesthetically pleasing stitches, making the various auxiliary machine functions required for all decorative seams very comprehensive. The requirements for high quality and diversity can be matched one by one. Equipping sealing rings everywhere can greatly enhance oil resistance.