The object of the present disclosure is to achieve a composite of dentin collagen obtained from human teeth and a growth factor with function of inducing bone growth, thereby improving a regeneration speed of alveolar bone. The present disclosure provides a method for manufacturing a bone graft composite, said method comprising: pulverizing a tooth to generate tooth powder, and washing and degreasing the tooth powder； demineralizing the degreased tooth powder so as to obtain dentin collagen； preparing a growth factor which includes a component to induce bone growth； and synthesizing a composite by mixing the obtained dentin collagen and growth factor.
