The invention discloses a humic acid urea, a preparation method thereof, and a composition for preparing the humic acid urea, and relates to the fields of fertilizers and chemical industry. The composition comprises, by weight, 60-150 parts of first urea, 17-35 parts of humic acid powder, and 3.5-12 parts of a composite binder. Raw materials of the composite binder include, by weight, 1.5-2.5 parts of second urea, 5-30 parts of humate, 3-15 parts of clay and 65-85 parts of water. The preparation method comprises the following steps: stirring and mixing the first urea and the composite binder for 2-6 min, adding the humic acid powder at 20-45 DEG C, and performing stirring for 5-10 min. The humic acid urea is prepared from the composition. The humic acid urea can effectively improve the utilization rate of nitrogen, and also can avoid environmental pollution. The preparation method has the advantages of simplicity, convenience, low cost, convenience in operation enforcement, and suitableness for large-scale industrial production. The composition has the advantages of easiness in obtaining, low cost, and great reduction of the requirements of raw materials.