This machine is a direct drive automatic thread cutting small square head overlock sewing machine, which can be used to sew decorative seams on various fabrics. Specially suitable for connecting or decorating small parts such as collars and cuffs. Using a small servo motor for direct drive instead of the original belt transmission, the start stop response is rapid, the transmission route is shortened, and the accuracy is improved. This model also has a series of automatic functions such as automatic thread cutting, automatic speed regulation, and automatic needle stop position, which can improve work efficiency, minimize sewing faults, and produce high-quality products.