The invention provides synthesis technology for preparing N-(5-methyl-1,3-thiazole-2-yl)-4-methyl-1,2,3-thiadiazole-5-methanamide and synthesis technology for synthesizing various intermediates of the compound, and also discloses a method for purifying the intermediates and a method for purifying the N-(5-methyl-1,3-thiazole-2-yl)-4-methyl-1,2,3-thiadiazole-5-methanamide. Ethyl carbazate prepared by a reaction of diethyl carbonate and hydrazine hydrate, and acetylacetic ether react to form 3-(carbethoxyhydrazone)ethyl butyrate; 3-(carbethoxy-hydrazone)-ethyl butyrate solution is dripped into thionyl chloride, and 4-methyl-1,2,3-thiadiazole-5-ethyl formate is obtained through reduced pressure distillation; the 4-methyl-1,2,3-thiadiazole-5-ethyl formate and methanol solution of NaOH are hydrolyzed and then are acidified to form 4-methyl-1,2,3-thiadiazole-5-formic acid, and then the 4-methyl-1,2,3-thiadiazole-5-formic acid and the thionyl chloride react to form 4-methyl-1,2,3-thiadiazole-5-formyl chloride; and 2-amino-5-methylthiazol and the 4-methyl-1,2,3-thiadiazole-5-formyl chloride react to form a product, namely the N-(5-methyl-1, 3-thiazole-2-yl)-4-methyl-1,2,3-thiadiazole-5-methanamide. The invention discloses optimum conditions for synthesizing the N-(5-methyl-1,3-thiazole-2-yl)-4-methyl-1,2,3-thiadiazole-5-methanamide.