The invention belongs to the technical field of organic synthesis, and relates to a preparation method of novel 5-acylamino-1,4,5-trisubstituted 1,2,3-triazole. The novel 5-acylamino-1,4,5-trisubstituted 1,2,3-triazole is prepared by catalyzing a ynamine compound and nitrine in an organic solvent and under the action of a catalyst of 1,5-cyclooctadiene iridium chloride dipolymer ([Ir(COD)Cl]2). The preparation method of a 5-acylamino-1,4,5-trisubstituted 1,2,3-triazole product is mild in reaction conditions, and the yield of the product is not lower than 70 percent; the preparation method is mild in reaction conditions, is green and is high in reaction efficiency and is more suitable for large-scale production requirements, and a prepared novel 5-acylamino-1,4,5-trisubstituted 1,2,3-triazole compound has potential physiological activity.