The invention discloses a special anti-cracking foliar fertilizer for a jujube tree, and a preparation method and an application thereof. The special anti-cracking foliar fertilizer for the jujube tree is composed of the following components in percentages by mass: 5% to 8% of potassium chloride, 7% to 15% of calcium chloride, 1% to 5% of borax, 1% to 5% of chelated magnesium, 1% to 3% of chelatediron, 0.5% to 1.5% of zinc sulfate, 0.2% to 0.6% of manganese sulfate and 3% to 4% of organosilicon, with the balance being water. The foliar fertilizer provided by the invention has low production cost, is safe and effective, and is beneficial for and harmless to human and livestock; mineral elements added in the foliar fertilizer are needed by animals, and can effectively prevent a variety of diseases like yellow-leaf disease and little-leaf disease caused by nutrient deficiency of a fruit tree; the disease resistance of a tree body is strengthened; the quality of a fruit is improved; the soluble sugar content of a fruit is improved by 14.3% to 43.5%, the weight of a single fruit is increased by 5% to 13.3%; the proportion of high-quality fruits is increased by 20.2% to 69.8%; the proportion of low-quality fruits is decreased by 28.9% to 76.9%; the fruit cracking rate of golden-silk jujube is significantly decreased by 30% to 45%; meanwhile, the contents of mineral elements in fruits and leaves are significantly improved; and the foliar fertilizer is free of any side effects, is safe and reliable, and is a green and environment-friendly product.