The invention relates to a special fully-watersoluble organic fertilizer for flue-cured tobacco and belongs to the technical field of fertilizers. The special fully-watersoluble organic fertilizer is composed of, by weight, 28-32 parts of humic acid, 38-43 parts of water-soluble organic matters, 1-3 parts of organic calcium, 1.5-2.3 parts of organic magnesium, 0.8-1.2 parts of boron salt, 0.9-1.1 parts of copper salt, 0.85-1.2 parts of ferric salt, 0.7-1.1 parts of manganese salt, 0.9-1.3 parts of zinc salt, 7-10 parts of amino acid, 10-15 parts of fulvic acid and 0.9-1.3 parts of phosphorus pentoxide, wherein the boron salt, the copper salt, the ferric salt, the manganese salt and the zinc salt are all soluble in water. The special fully-watersoluble organic fertilizer is excellent in water solubility and less in impurities, water insoluble matters are smaller than or equal to 0.5%, and the fertilizer is quickly soluble in water and uniformly distributed into plant root soil along with water. Moreover, the special fully-watersoluble organic fertilizer is high in active ingredient content and small in usage amount, so that cost for packaging, storing, transporting and utilizing can be reduced.