Doudou quilt is a quilt made of soybean protein fiber. Soybean protein fiber is a kind of regenerated plant protein fiber. It is made of soybean powder after oil pressing. Extraction of globulin from soybean meal by bioengineering technology. By adding functional additives, grafting, * * polymerization and * * * mixing with high polymers such as nitrile group and hydroxyl group, protein spinning solution with a certain concentration is made, which changes the spatial structure of protein and is made by wet spinning. Doudou quilt and ordinary quilt actually have the same warm-keeping effect.