This fully-computerized sewing machine has the features of high speed, low noise and excellent sealing performance, among others. It can automatically cut yarns and knit socks one after another. The product is made in full compliance with European and Japanese standards. Its critical components are all formed by high-quality materials to ensure a smooth delivery. It is noteworthy that the conveyor can rotate 180 degrees, which provides much convenience for threading and yarn clearing. In addition, this machinery is configured with a secondary thread cutter, thus providing an exceptional cutting effect and also reducing the labor fatigue.