The invention relates to palladium/carbon catalyst hydrogenation activity evaluating method and device. The device comprises a reaction evaluating bottle arranged on an electromagnetic stirrer, a vacuum pump, a hydrogen inlet pipeline and a valve, a vacuum pressure sensor and an emptying pipe, wherein the electromagnetic stirrer is provided with a time relay and a stirrer voltage meter; the vacuum pump is connected with the reaction evaluating bottle through a pipeline and a valve; the hydrogen inlet pipeline and the valve are connected with the reaction evaluating bottle; the vacuum pressuresensor is connected with the reaction evaluating bottle, a pressure recorder is connected with the vacuum pressure sensor; and the emptying pipe is provided with an emptying electromagnetic valve. The invention judges the hydrogenation property of a palladium/carbon catalyst by adopting a method of measuring hydrogen consumption of reaction liquid within unit time per catalyst during the reactionwithout being evaluated by practical reactions. Active results of a new catalyst and an old catalyst are rapidly compared and clear, therefore, the invention is also suitable for the hydrogenation property evaluation of the palladium/carbon catalyst and other palladium/supporter catalysts.