The invention discloses a composite bovine colostrum powder for improving bone mineral density. The formula is that each 100g of the composite bovine colostrum powder comprises 37-45g of bovine colostrum powder, 15-22g of chitosan powder, 11-19g of ossein albumen powder, 7-14g of calcium acetate and 0.014-0.018g of vitamin D3 micro-capsule powder (500 thousand IU / g), and the balance of defatted milk powder. Compared with the prior art, the composite bovine colostrum powder for modifying the retrogressive osteoporosis and improving the bone mineral density, provided by the scheme of the invention, belongs to the health-care products; after being used, the bovine colostrum powder has no toxic or side effects; and the composite bovine colostrum powder has the functions of conditioning the immune level of a human body, improving the acid-base balance of the human body, replenishing the organic acid calcium, enhancing the calcium absorption, increasing the osteogenesis level and the like, and is particularly applicable for being taken by patients of retrogressive osteoporosis.