The utility model relates to a hydrogenation device of recoverable reaction heat. The purpose be the device that provides once only hydrogenation target in place, can the steam raising, reduce the production energy resource consumption, coproduction in -process temperature can be effectively controlled, product quality obtains guaranteeing. Technical scheme is: a hydrogenation device of recoverable reaction heat, includes the hydrogenation tower, the device still includes mixture entry, hydrogenation pre -reactor and the steam generator who inserts hydrogenation tower entry after consecutive again, after connecting in parallel, first a plurality of exports that are equipped with high difference of hydrogenation pre -reactor, these exports put through steam generator through the pipeline that communicates and have pneumatic switch valve separately again to temperature difference according to hydrogenation pre -reactor export material is opened respectively, steam generator is last to be connected with the steam outputting pipe that soft water input tube that input soft water used and output steam were used.