NOVELTY - Preparing tricalcium phosphate byproduct and safflower special fertilizer, comprises e.g. reacting phosphoric acid with carbamide, adjusting temperature to 130-140 degrees C for ionized separation to obtain dihydrogen phosphate ions and carbamide cations, where carbamide cations and phosphoric acid combined to form ionic phosphate (I), then adding calcium ions to obtain tricalcium phosphate product slurry, cooling-crystallizing and filtering to obtain tricalcium phosphate, then adding potassium component into filtrate, concentrating obtained slurry, and granulating to obtain safflower fertilizer.    USE - The method is useful for preparing tricalcium phosphate byproduct and safflower special fertilizer (claimed).    ADVANTAGE - The method: avoids discharge of waste, and reduces production cost; and is environment-friendly, and economical.    DETAILED DESCRIPTION - Preparing tricalcium phosphate byproduct and safflower special fertilizer, comprises reacting phosphoric acid with carbamide to obtain urea phosphate, adjusting temperature to 130-140 degrees C for ionized separation of urea phosphate to obtain dihydrogen phosphate ions and carbamide cations, where carbamide cations and phosphoric acid combined to form ionic phosphate of formula (I), then adding calcium ions to obtain tricalcium phosphate product slurry, carrying out cooling-crystallization, stopping the crystallization when content ratio between nitrogen, phosphorus and calcium is 4-6:4-6:0.5-0.7, and then centrifugal filtering to obtain tricalcium phosphate as filter cake, and drying the filter cake at 80-90 degrees C in an oven until moisture content reaches 1-4% to obtain tricalcium phosphate with purity of 96-98.5%, then adding potassium component into the obtained filtrate to make molar ratio between nitrogen, phosphorus potassium components to be 4-5:4-5:1-2 to obtain safflower special fertilizer slurry, concentrating fertilizer slurry to a 11-17% moisture content of 11-17% at 100-120 degrees C, placing the concentrated slurry into a granulator, granulating, drying to a moisture content of 2-3% in a dryer at 90 degrees C, and sterile packing to obtain safflower special fertilizer.