The TT industrial yarn doubling machine has many advantages such as high twisting efficiency, large tube capacity, uniform twist, and controllable single and multi spindle processes. It is the first choice for twisting special industrial silk products. Among them, the multi-channel tension stretching device can accurately control the tension requirements, and the spindle can air ring protection cover and protective plate can effectively control the range of the air ring, ensuring the safety of operators. The top conveying system can increase conveying efficiency, reduce manual input and labor intensity.