The invention belongs to the technical field of fertilizer production, and in particular relates to a garden greening high-nutrition environmentally-friendly compound fertilizer formula and a preparation method and application thereof, and the garden greening high-nutrition environmentally-friendly compound fertilizer comprises 45-75 parts of humic acid fertilizer, 25-35 parts of urea, 5-15 parts of potassium nitrate, 7-14 parts of monoammonium phosphate, 5-12 parts of potassium dihydrogen phosphate, 10-20 parts of ammonium bicarbonate, 8-18 parts of magnesium sulfate, 5-10 parts of sodium citrate, 3-13 parts of molybdenum sulfate, 5-19 parts of calcium silicate, 8-19 parts of iron ammonium phosphate and 1-10 parts of EDTA chelated zinc. The formula has the advantages of improving soil aggregate structures, loosening soil, improving soil water and fertilizer conservation capacity, regulating pH value, reducing the content of heavy metals in the soil, and reducing the harm of salt ions to garden plants.