The invention relates to a novel calcium supplementing preparation with functions of improving bones and joints, which is prepared from the following raw materials in parts by weight: 10-42 parts of calcium source components, 5-25 parts of amino sugar components, 0.1-5 parts of casein phosphopeptide, 0.5-5 parts of bone collagen protein, 0-8 parts of oxidation resistant components for human bodies and 0-3 parts of filling agents. The novel calcium supplementing preparation not only can supplement a calcium source to increase the bone hardness, but also can supplement bone collagen protein to increase the bone toughness for preventing calcium loss; the casein phosphopeptide is added to promote the calcium absorption, thereby solving the problem of the calcium absorption in the calcium supplementing process; and simultaneously, the oxidation resistant components and the components for promoting osteoblast proliferation are added to enable the bone reconstruction process formed by bone formation and bone absorption to balance again, thus the supplemented calcium can be reserved and firmly deposited on the bones. The related components in the novel calcium supplementing preparation can restore cartilages, improve the joint structure and interdict the deterioration of osteoarthritis.