Soybean protein fiber belongs to the category of regenerated plant protein fiber. It uses edible grade soy protein powder as raw material, uses bioengineering technology to extract globulin in protein powder, and connects with high polymers such as nitrile and hydroxyl groups by adding functional additives. Branching, copolymerization, and blending make a protein spinning solution with a certain concentration, change the spatial structure of the protein, and are produced by wet spinning. It has cashmere-like soft touch, silk-like soft luster, better thermal stability than cotton and good skin-friendly properties. It is known as "a healthy and comfortable fiber for the new century" and "good skin-like fabric". The outer layer of soy protein fiber is basically protein, containing a variety of amino acids necessary for the human body, its health care function is self-evident.