The invention discloses a formula of oat cream and a preparation method thereof, and relates to the technical field of food. The oat cream comprises the following formula: oat flour, anhydrous cream, refined vegetable oil, ground cinnamon, walnut kernel powder, insect active protein powder, coix seed powder, condiments, toners, additives and purified water. The nutritional value and applicable groups of the oat cream can be improved by adding the oat flour, the cinnamon powder, the walnut kernel powder and the coix seed powder, the insect active protein powder can also effectively promote skeletal development, the color matching product is added, so that the diversity of cream colors can be enhanced; meanwhile, the color matching product adopts fruit and vegetable juice with green nutritional value; the vitamin content in the cream is increased, and vitamins needed by the human body are supplemented; buffer salt in the seasoning reduces casein micelle aggregation in the heat treatment process, fat globule membranes are protected, no fat aggregation particles exist, and the stability of the product at the low temperature and the normal temperature storage period is effectively guaranteed.