The invention discloses an areca catechu controlled-release fertilizer and a preparation method thereof. The controlled-release fertilizer is prepared by compounding ingredients, such as reactive film forming and enveloping urea with enveloping quantity of 4%and enveloping quantity of 5% (at different nutrient release periods), urea, diammonium phosphate, potassium sulfate and borax. The special nutrition-synchronized controlled-release fertilizer for areca catechu, disclosed by the invention, is compounded according to the characteristics, nutrient demand law and required nutrient elements of the normal growth, development and cultivation of areca catechu, nutrients required by areca catechu can be supplied continuously and synchronously, the needs of three key elements, namely nitrogen, phosphorus and potassium, and a nutrient element, namely boron, in a yearly growth period of areca catechu are met, and the fertility is more lasting, so that the plant body resistance is effectively adjusted, the diseases are reduced, the yield is increased, the quality of crops is greatly improved, and the mouth feel of areca catechu is good; the problem of high cost caused by the fact that the controlled-release fertilizer is used alone is solved; and meanwhile, the fertilization times can be decreased by 1-2 times, so that the labor intensity is reduced.