The invention discloses an organic-phosphonate-based organic energy-saving and emission-reduction agent for an industrial boiler. The organic-phosphonate-based organic energy-saving and emission-reduction agent comprises, by mass, 15%-25% of 1-Hydroxyethylidene-1,1-diphosphonic acid, 10%-15% of butane phosphate-1,2,4-tricarboxylic acid, 5%-10% of maleic acid-acrylic copolymer, 2%-3% of morpholine, 1%-2% of diethylhydroxylamine, 0.2 %-0.8% of tannin alkali metal salt and the balance water. The organic-phosphonate-based organic energy-saving and emission-reduction agent is free of inorganic chemical ingredients, all the components in the formula are organic, the water dissolved solid matter, the blowdown rate and the heating surface scaling rate of the industrial boiler are lowered effectively, and the chemical cleaning period of the boiler is prolonged; the agent is high in scale inhibition corrosion inhibition efficiency, small in feeding quantity, free of poison, low in cost, wide in ingredient source, stable in high-temperature performance, capable of adjusting the return condensate quality and lowering the return water system corrosion rate and suitable for industrial boilers of various types and various supply water quality conditions, and the boiler operation water quality index of the boilers is not affected in use.