The invention relates to a composite fertilizer special for dragon fruits. The composite fertilizer consists of urea, ammonium nitrate, monoammonium phosphate, potassium sulfate, humic acid salt, chitosan, borax, zinc chloride, sodium molybdate, manganese sulfate, ferrous sulfate, magnesium sulfate, copper sulfate, salicylic acid, sodium dodecyl benzene sulfonate, dimethyl sulfoxide, monosodium glutamate waste liquor, an EM (effective microorganism) liquid and the like. The composite fertilizer disclosed by the invention is used for overcoming the defects that the specially applied fertilizer is lack in the current dragon fruit cultivation production, the fertilizer use amount is high and organic nutrition components are few.