The water soluble composite nutrient reinforced is prepared through the steps of acid dissolution of active calcium, pickling, drying to eliminate acid, mixing with vitamin D, Mg and xanthic gum, dissolutlion with pure water, milling to emulsify, refining, spraying to dry or heating to dry and milling to obtain 100-150 mesh product. The product of the present invention can be added into water soluble food including calcium oral liquor or dry food including calcium tablet, and has high biological calcium nutrient content, strong activity, no stimulation to gastrointestinal tract, high absorption and certain synergistic effect. |