This machine is a flat plate high-speed single needle herringbone sewing machine (with 2-point and 4-point pattern switching functions). Suitable for the sewing process of tight waistbands, shorts, swimwear and other sewn products, it can continuously sew all the way to the end, improving work efficiency. It can suppress the diagonal wrinkles and misalignment of the rubber bands on the sewing belt on the flat head, expand the operating platform, and can sew 50mm wide cloth bands. It can also sew lace on tight shorts. With a simple toggle switch, one machine can perform 2-point herringbone sewing and 4-point herringbone sewing, greatly improving the efficiency of the sewing machine.