Silkworm cocoon, usually refers to the cocoon of silkworm, is a kind of sac-like protective layer in the pupa stage, which contains pupae. Cocoon includes cocoon layer, cocoon layer and pupa lining. Cocoon layer can be reeled; Cocoon clothing and silk reeling waste can be used as raw materials for silk cotton and silk spinning; Pupa is rich in protein and vitamin B, which can be used for medicine and extracting pupa oil, and can also be used as feed for fish and livestock.