The invention discloses a pregnant sow special-purposed bioactive 
feed additive, a feed premix, and a feed batch. The 
feed additive is prepared through the steps that: (1) a Chinese herbal 
medicine is prepared into Chinese herbal 
medicine powder, wherein the 
powder comprises the raw materials of, by weight: 15-30 parts of Mongolian 
milkvetch root, 6-15 parts of 
ligusticum, 10-25 parts of pilose asiabell root, 5-20 parts of largehead atractylodes 
rhizome, 5-20 parts of licorice root, 15-30 parts of immature 
tangerine fruit and dried 
tangerine peel, 10-40 parts of malt, 6-15 parts of Chinese pulsatilla, 8-20 parts of prepared 
rehmannia rhizome, and 16-40 parts of Szechwan lovage 
rhizome; (2) 15-20 parts by weight of a bioactive probiotics 
fermentation broth is uniformly mixed with 15 parts by weight of 
silicon dioxide; the mixture is subjected to low-temperature 
drying, such that a bioactive probiotics 
solid powder preparation is prepared; (3) 90% by weight of the Chinese herbal 
medicine powder obtained in the step (1) is uniformly mixed with 10% of the bioactive probiotics 
solid powder preparation obtained in the step (2), such that the 
feed additive is obtained. When the additive is used for feeding pregnant sows, healthy developments of fetuses in the mothers can be promoted. Also, pregnant sow 
miscarriage, stillbirths, mummified pig, postnatal hunger strike, 
mastitis, 
endometritis, and the like can be prevented. With the feed additive, piglet 
vitality and 
birth weight can be improved.