The invention discloses a fertilizer additive for promoting growth of angelica dahurica roots. The fertilizer additive is prepared from the following raw materials: zeatin, brassinolide, 6-benzylaminopurine, compound sodium nitrophenolate, diethyl aminoethyl hexanoate, tetramethyl glutaric aciduria, centipede, rhizoma dryopteris crassirhizomae, agrimonia pilosa, wedelia chinensis, frankincense, crinis carbonisatus, dragon's blood, barleria cristata, humifuse euphorbia herb, polyacrylate macroporous resin, a 15% (v / v) alcoholic solution, and sodium selenite. The product has the advantages of simple preparation, and low requirements to equipment, and can be industrially produced; the plant hormones can enhance stress resistance of angelica dahurica, inhibit bolting, promote root cell division and improve the yield and quality; the Chinese herbal medicines can reduce incidence rate of pest and disease damage of angelica dahurica, and improve the quality and economic benefits; with addition of the selenium-enriched components, the content of selenium in angelicae dahuricae is improved, and the functions of angelica dahurica for resisting oxidization, resisting aging, enhancing the resistance and protecting heart and cerebral vessels are enhanced; the neutral macroporous resin is used for adsorption, the additives have little amount, residues cannot be caused, slow release is effectively controlled, the utilization rate is high, and costs are saved.