A milk, fruit and vegetable corn flour and a preparation method thereof are disclosed. The corn flour is characterized by being composed of the following raw materials in parts by weight: 150 to 160 parts of niblet, 1 to 2 parts of Chinese angelica, 0.8 to 1 part of dandelion, 1.5 to 2 parts of American ginseng, 1.8 to 2 parts of bamboo shavings, 1 to 1.5 parts of arborvitae seed, 0.9 to 1.2 parts of salvia kiangsiensis, 1.3 to 1.7 parts of sensitive joint vetch wood, 10 to 11 parts of peanut, 15 to 19 parts of mung bean, 1 to 2 parts of olive oil, 35 to 40 parts of milk, 50 to 55 parts of duck meat, 2 to 3 parts of edible fungus, 5 to 6 parts of strawberry, 4 to 5 parts of white gourd, 18 to 20 parts of coix seed, 4 to 5 parts of pickled vegetable, and 7 to 8 parts of nutrition additive. The corn flour has a rich vegetable and fruit fragrance, a milk fragrance, and a good taste; at the same time, duck meat is added to increase the nutrition of the corn flour and enable the corn flour to have a special flavor; moreover, the corn flour contains a plurality of traditional Chinese herbals, so the corn flour has the functions of tonifying qi, nourishing yin, clearing heat, removing toxicity, enriching and activating blood, nourishing heart, and tranquilizing, and is a green healthcare food.