Process for synthesizing hindered amine light stabilizer 944

The invention relates to a process for synthesizing a hindered amine light stabilizer 944. The process comprises the following specific steps: adding cyanuric chloride into a solvent to be stirred anddissolved, dropping a tert-octylamine solution and stirring, maintaining the temperature after dropping completion, dropping a sodium hydroxide solution, maintaining the temperature after dropping completion, washing and filtering to obtain an intermediate 1 solution; mixing the intermediate 1 solution and water, maintaining the temperature, cooling, filtering and desolventizing to obtain an intermediate 2; sequentially adding a sodium hydroxide solution and hexamethylendiamine piperidine into the intermediate 1 solution, raising the temperature to 90-120 DEG C, maintaining the temperature for 0.5-2 hours, continuously heating, maintaining the temperature for 0.5-2 hours while raising the temperature by 5-15 DEG C each time, and maintaining the temperature for 5-15 hours after the solution is heated to 130-160 DE