The invention discloses polymorphic nitrogenous 
fertilizer and a preparation method thereof. The polymorphic nitrogenous 
fertilizer comprises, by weight, 13-18 parts of 
urea, 63-65 parts of 
ammonium sulfate, 13-15 parts of 
ammonium chloride, 3-4 parts of animal hairs and feathers, 14-16 parts of modified attapulgite, 0.6-0.8 part of 
zinc sulphate monohydrate, 0.2-0.4 part of micronutrients 
fertilizer, 3-8 parts of 
ferrous sulfate, 0.3-0.5 part of 
nitrogen-fixing 
bacteria, 2-4 parts of modified nanocarbon, 1-3 parts of fructus cnidii, 5-7 parts of pomegranate tree roots and 9-11 parts of 
willow leaves. The feathers and the like are hydrolyzed by acid to form 
amino acid, secondary and trace elements are chelated, 
carboxymethyl cellulose increases a 
chelation structure of the secondary and trace elements so as to facilitate effective utilization of the secondary and trace elements, and invalid release of the secondary and trace elements is reduced. The polymorphic nitrogenous fertilizer is suitable for crops of wheat, rice, corn, soybean, rape and the like, can urge the wheat and the rice to turn green rapidly, be much in shooting and longing resistant and enhance chill-proof, drought-resistant and 
disease and 
insect resistant capacity, and enables cotton and linen crops to enhance tension and strength of 
fiber and improve output and quality remarkably.