The invention discloses the semifluid extract of deer foetus, which takes the deer foetus, deer born after the normal period of gestation and not fed by breast milk, American ginseng, medlar, eucommia bark, white paeony root, spina date seed, villous amomum fruit, safflower, echinacea, astragalus and honey as raw materials. The semifluid extract of deer foetus is prepared by the following steps of: pre-treating the deer foetus and the deer born after the normal period of gestation and not fed by the breast milk, preparing deer foetus powder and the powder of the deer born after the normal period of gestation and not fed by the breast milk from the deer foetus and the deer born after the normal period of gestation and not fed by the breast milk by adopting freeze-drying technology, compounding the deer foetus powder, the powder of the deer and the other components according to proportion, and performing bulking and sterilization to prepare the semifluid extract. The semifluid extract of deer foetus completely maintains the bioactive ingredients of the deer foetus and the deer born after the normal period of gestation and not fed by the breast milk, has the double effects of treatment and nourishing, and is particularly suitable to be taken by weak patients with immune dysfunction, female chronic pelvic inflammatory disease, leucopenia after cancer chemotherapy and radiotherapy, and the like.