The invention relates to agricultural fertilizers, and especially relates to humic acid urea. The humic acid urea is characterized by being composed of the following raw materials in percent by weight: 35-45% of urea, 25-35% of humic acid, 8-10% of bentonite, and 10-32% of fluorspar powder. Urea has the nitrogen fertilizer content of 46% or more, humic acid is weathered coal which possesses the organics content of 60% or more and humic acid content of 45% or more and is sieved by an 80-120 mesh sieve. Humic acid is capable of inhibiting action of urease, alleviating decomposition of urea and prolonging urea fertilizer efficiency. The humic acid urea has slow-release and long-term release effects in farmland, helps to improve urea utilization rate, gives play to effects of improving product quality, improving soil physical and chemical properties, adjusting soil acid-base value, promoting action of soil microbes, increasing activity of soil enzyme, loosening soil, adjusting water, fertilizer, gas and thermal statuses of soil, promoting plant root growth, enhancing conversion speed of organic inorganic fertilizers in soil, increasing plant chlorophyll, improving plant photosynthesis, improving plant resistance, and preventing soil hardening and desertification and environment pollution caused by excessive application of inorganic fertilizers to soil, and also has the advantages of preventing plant physiological diseases and the like.