NOVELTY - Nano compound fertilizer comprises e.g. 5-19 wt.% of urea, 2-5 wt.% of monoammonium phosphate, 4-5 wt.% of potassium sulfate, 4-6 wt.% of potassium dihydrogen phosphate, 10-13 wt.% of nanometer ferrous sulfate with granule diameter of 10-20 nm, 10-15 wt.% of nanometer carbon with granule diameter of 10-20 nm, 10-15 wt.% of humic acid, 5-7 wt.% of lignin, 3-5 wt.% of butyl acrylate, 5-10 wt.% of water, 1-5 wt.% of chitosan, 3-7 wt.% of sodium borate, 0.5-1 wt.% of zinc chloride, 0.05-0.3 wt.% of sodium molybdate and 0.05-0.1 wt.% of manganese sulfate.    USE - The nano compound fertilizer is useful for Gynura divaricata plant.    ADVANTAGE - The nano compound fertilizer promotes the growth of the plant in an environmentally-friendly manner.    DETAILED DESCRIPTION - Nano compound fertilizer comprises 5-19 wt.% of urea, 2-5 wt.% of monoammonium phosphate, 4-5 wt.% of potassium sulfate, 4-6 wt.% of potassium dihydrogen phosphate, 10-13 wt.% of nanometer ferrous sulfate with a granule diameter of 10-20 nm, 10-15 wt.% of nanocarbon with a granule diameter of 10-20 nm, 10-15 wt.% of humic acid, 5-7 wt.% of lignin, 3-5 wt.% of butyl acrylate, 5-10 wt.% of water, 1-5 wt.% of chitosan, 3-7 wt.% of sodium borate, 0.5-1 wt.% of zinc chloride, 0.05-0.3 wt.% of sodium molybdate, 0.05-0.1 wt.% of manganese sulfate, 0.05-0.3 wt.% of sodium dodecyl benzene sulfonate, 0.8-2 wt.% of ferrous sulfate, 0.03-0.8 wt.% of magnesium sulfate, 0.01-0.05 wt.% of copper sulfate, 0.2-2 wt.% of dimethyl sulfoxide, 2-3 wt.% of animal manure and 2-5 wt.% of vegetable plant fiber as raw materials, where the plant fiber comprises straw, sedge, corn cob and/or bagasse, and the animal manure comprises pig manure, cattle manure, sheep manure, chicken and/or duck manure, where the compound fertilizer is prepared by: (1) selecting the raw materials; (2) crushing the vegetable plant fiber into powder; (3) uniformly mixing and stirring the animal manure with the plant fiber powder, piling the mixture in a fermenting pond to ferment using a wet material, covering the fermenting pond using a moisturizing heating-insulating material, turning the pile for first time after 60 hours when temperature of an inner pile is 50-70 degrees C, turning the pile for second time in an interval of 24 hours, and stopping the fermenting process after turning the pile for 3 times; and (4) mixing the fermented product with urea, monoammonium phosphate, potassium sulfate, potassium dihydrogen phosphate, nano ferrous sulfate, nano carbon, humic acid, lignin, butyl acrylate, water, chitosan, sodium borate, zinc chloride, sodium molybdate, manganese sulfate, sodium dodecyl benzene sulfonate, ferrous sulfate, magnesium sulfate, copper sulfate and dimethyl sulfoxide, placing the mixture into a reaction kettle, dissolving the mixture in water, stirring the solution at 100-120 degrees C for 2 hours, and filtering the solution using 200 meshes screen to remove residue; and (5) adding nano ferrous sulfate and nano carbon into the filtered solution, and uniformly stirring the mixture. An INDEPENDENT CLAIM is included for a method for fertilizing the compound fertilizer, comprises: (a) mixing the compound fertilizer in water for 200 times, and spraying the diluted fertilizer on the soil from seeding for two times in an interval of 3 days; (b) diluting the fertilizer using water for 300 times, and uniformly spraying the diluted fertilizer on a leaf face for twice a week; (c) diluting the fertilizer using water for 300 times, applying the diluted fertilizer onto the bud in an interval of two days, and uniformly spraying the diluted fertilizer around the plant and leaf; and (d) diluting the fertilizer using water for 400 times, applying the diluted fertilizer onto the flower and spraying the diluted fertilizer around the plant, and avoiding contact of the fertilizer with a petal.