The invention provides a method for synthesizing p-aminobenzamide, comprising the steps of: 1) taking a container, adding p-nitrobenzoic acid, triphosgene and a solvent, after the reaction is completed, collecting the solvent to obtain p-nitrobenzoyl chloride; ) take another reaction vessel, add ammonia and phase transfer catalyst, drop p-nitrobenzoyl chloride toluene solution to obtain p-nitrobenzamide; 3) take the reaction kettle, add p-nitrobenzamide, and add water, Catalyst, obtains described p-aminobenzamide. In the method, the amount of raw materials used is small and the reaction speed is fast. After the hydrogen chloride gas produced by the reaction is absorbed into hydrochloric acid by water, it can be used for other purposes, which effectively reduces the production cost. In the reduction reaction, the iron powder method is replaced by the hydrogenation method, so that the production The cost is reduced, no solid waste is generated, the labor load is greatly reduced, the process is environmentally friendly, and the economic benefit is good.