The invention discloses a value-added humic acid urea and a preparation method thereof. The value-added humic acid urea is characterized by comprising the following raw materials in parts by weight: 85-95 parts of humic acid urea, 1-4 parts of a water-retaining agent, 1-4 parts of medium trace elements, 0.3-3.0 parts of a microbial agent, 0.04-1.2 parts of herbicide, 0.5-5.0 parts of viscous oil and 0.1-0.5 parts of an additive. The value-added humic acid urea is drought-resistant, water-retaining, fertilizer-conserving, balanced in nutrients, controlled-release, weeded, environment-friendly, time-saving and labor-saving, low in cost and the like, both production and income are increased, the quality is improved, the soil fertility is enriched, and the soil is modified and repaired. The value-added humic acid urea can be applied to a plurality of soils and a plurality of crops in arid regions, semi-arid regions and seasonal drought regions as a base fertilizer or topdressing, and the value-added humic acid urea is simple in preparation technology, and convenient to produce and operate.