Fly maggot extractive as well as preparation method and application thereof

The invention discloses a fly maggot extractive containing the principal components of water-soluble proteins, and the water-soluble proteins contained in the fly maggot extractive have the mass percentage of 50-70 percent and the molecular weight of 2-16 KDa. The fly maggot extractive not only has obvious inhibiting effect on human promyelocytic leukemia HL-60 cells, human erythroleukemia K562 cells, human liver cancers SMMC-7721, mouse leukemia P388 cells, human lung adenocarcinoma A549 cells, human nasopharyngeal darcinoma CNE cells, human prostatic carcinoma PC3 cells, human cervical carcinoma HeLa in vitro, but also has outstanding inhibiting effect on mouse S180 sarcomas and mouse Heps liver cancer solid tumors, and also has the effect on enhancing the humoral immunity of organisms. The invention also discloses a preparation method of the fly maggot extractive. The preparation method is easy and convenient for operation and control and low in cost and is suitable for industrialized production.