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This application provides a collagen peptide for increasing bone density and a method for preparing the same. The method includes the following steps: S1: dispersing bone gelatin in water to obtain a bone gelatin solution; S2: adding 0.1-1 mol / L acidic pH adjuster to the bone gelatin solution at a rate of 1-10 mL / min until the turbidity of the system increases by 10%-20% compared to the initial bone gelatin solution, then stopping the addition, allowing it to stand for 10-30 min, and filtering to obtain a bone gelatin supernatant; S3: adding an endopeptide to the bone gelatin supernatant to obtain an enzymatic hydrolysate; S4: post-processing and drying the enzymatic hydrolysate to obtain collagen peptides. This method can increase the mass ratio of low molecular weight peptides in the obtained collagen peptides, resulting in a composition of collagen peptides more suitable for bone metabolism and utilization to increase bone density.