The invention discloses a pudding-vitamin D3 mixing nutrient liquid capable of relieving gastricism, and a prepareation method of the pudding-vitamin D3 mixing nutrient liquid. The method comprises the following steps: (1) mixing water and pudding powder according to the proportion of 10:1, stirring the water and the pudding powder so as to obtain a mixture, and boiling the mixture in water for 10-15 minutes so as to obtain a mixed liquid; (2) mixing and stirring papaya powder, blueberry juice and water according to the proportion of 1:1:4 so as to obtain a mixed liquid; 3) pouring the mixed liquid obtained in the step (2) into the mixed liquid obtained in the step (1) so as to obtain a mixture; ( 4) cooling the mixture obtained in the step (3) under normal temperature; (5) obtaining pudding; (6) heating the obtained pudding to 100 DEG C, keeping heating for 20 minutes, adding radix polygonati officinalis, tremella, Chinese yam, coptis chinensis and malt under the temperature of 80-90 DEG C, adding 5-6g of brown tea every 2-5 minutes, performing filtration with a screen of 200 meshes, extracting liquid; (7) taking vitamin D3, mixing the vitamin D3 with the liquid obtained in the step (6) so as to obtain the nutrient liquid. The nutrient liquid is varied in flavor and unique in taste, so that the nutrient liquid can meet the demands of people for delicious food; the preparation method of the nutrient liquid is simple, and the cost of the nutrient liquid is low, so that the nutrient liquid is favorable for improving economic benefits; the nutrient liquid can have good effects after being used for a long term.