The invention discloses deer bone tablets. The deer bone tablets are prepared from, by weight, 120-180 parts of deer bone powder, 120-180 parts of collagen, 120-180 parts of calcium carbonate, 50-100 parts of rhizoma drynariae extract, 8-25 parts of casein phosphopeptides and 70-160 parts of pharmaceutic adjuvants. The invention further provides a preparing method and application of the deer bone tablets. The deer bone tablets have a remarkable bone mineral density increasing effect, are especially suitable for middle-aged and aged people, and can be orally taken as a healthcare product, and the eating suggestion is twice a day, three pieces each time. The preparing method is simple, and the obtained deer bone tablets have good performance and high stability.