The invention provides a method for continuous hydrogenation of dinitrobenzene and recycling of reaction heat thereof. The method comprises the following steps: (1) adopting a plurality of stages of hydrogenation reaction kettles which are connected in series, continuously leading the materials dinitrobenzene and methanol to a first stage of a hydrogenation reaction kettle, and simultaneously leading in hydrogen continuously and adding a catalyst, carrying out a liquid-phase catalytic hydrogenation reaction, and continuously feeding the material from the final stage of hydrogenation reaction kettle to a mature kettle to cure and cool; meanwhile, removing hydrogenation reaction heat by water, so as to obtain hot water of 105-120 DEG C; and (2) orderly carrying out continuous sedimentation, filtering and separation on hydrogenation reduction cooling fluid from the mature kettle, and then recovering and mechanically applying the separated catalyst in cycle, and carrying out dealcoholization, dehydration and rectification on the separated hydrogenation reduction fluid to obtain diaminobenzene. Thus, effective utilization of reaction heat energy is achieved on the premise of efficiently producing the diaminobenzene; the aim of saving energy is achieved.