The invention discloses a method for synthesizing 6-chlorine-2-(para hydroxyl)-phenoxyl-benzoxazole, which comprises the steps: hydroquinone, alkali and catalyst are dissolved in the water; after the temperature raises to 40-80 DEG C, the mixture is added with 2, 6-dichlorobenzoxazole and toluene to react for 0.5-6 hours, and then the temperature raises to 80-120 DEG C to continuously react for 0.5-4 hours; when the reaction is finished, the 6-chlorine-2-(para hydroxyl)-phenoxyl-benzoxazole is obtained by separation; wherein, the weight ratio of the alkali, the hydroquinone, the catalyst and the 2, 6-dichlorobenzoxazole is 15-30:45-75:1-10:80-110. The method inhibits the occurrence of side reaction, improves the yield of reaction, saves the cost, better simplifies the difficulty of sewagedisposal, and is more beneficial to the environment.