The invention discloses blueberry special fertilizer and a preparation method thereof; the granular blueberry special fertilizer is obtained mainly by crushing raw materials of organic materials, ammonium sulfate, ammonium dihydrogen phosphate, potassium sulfate, ferrous sulfate, and sulphur according to certain weight percents, screening, and performing mechanical granulation. The blueberry special fertilizer of the invention promotes the growth of blueberry, provides blueberry plants with a normal leaf color, strong branches, a high fruit-setting rate, and improved blueberry fruit quality, provides the possibility of large area planting of blueberry in our country, and fills the gap of domestic blueberry fertilizer.