Adopting the "automatic fabric thickness sensing system", it has more efficient production performance and high-quality sewing quality. In addition the sewing range has been expanded, and the sewing pattern has reached 50. On the one hand, it is equipped with an electronic thread clamping mechanism, an automatic presser foot ifting mechanism, and the enlargement and reduction function enables adiustment at the sewing start point, thereby having better operation performance; on the other hand, it is equipped with a reliable control box, which is easy to use To operate the control panel.