Soy protein fiber belongs to the class of degradable and regenerated plant protein fiber. It is a new type of textile material independently developed by high-tech. It is praised by domestic and foreign experts as "healthy and comfortable fiber in the 21st century". Its industrial production technology has obtained the national invention patent technology certificate, filling international and domestic gaps. Soy fiber is the only fiber invented by the Chinese, and it is a healthy and comfortable fiber in the 21st century.