The invention discloses cornus officinalis juice, yoghourt, preparation methods of the cornus officinalis juice and the yoghourt, as well as a raw material composition. The preparation method of the cornus officinalis juice disclosed by the invention comprises the following steps: taking fresh cornus officinalis fruits; cleaning, squeezing juice and filtering; mixing skim milk with filtered fresh cornus officinalis fruits, standing and taking away the puckery taste; and filtering again. Both the raw material composition and the yoghourt which are disclosed by the invention contain the cornus officinalis juice. The preparation method of the cornus officinalis juice disclosed by the invention is simple in steps, convenient to operate, and low in energy consumption; and the prepared cornus officinalis juice is ruby red in color and luster, clear in texture, sour in taste, and free of a bitter taste. The yoghourt disclosed by the invention contains the cornus officinalis juice and yam flour, is comprehensive in nutrition, has multi-health efficacies, is fine and uniform in texture, and moderate in viscosity, does not separate out whey, has unique aroma of the cornus officinalis and frankincense of fermented milk, and is moderate in acidity and sweetness, fresh and smooth in taste, and free of peculiar smell. The preparation methods of the cornus officinalis juice and the yoghourt, which are disclosed by the invention, are simple in processes, and suitable for industrial production.