The utility model relates to a residual oil hydrogenation device. Raw material tank, a discharge hole of the raw material tank is communicated with a first pump; a liquid outlet of the first pump is communicated with a first membrane filter, a concentrated liquid outlet of the first membrane filter is connected with a first concentrated liquid pipe and a second concentrated liquid pipe in parallel, the first concentrated liquid pipe is communicated with the raw material tank, the outlet end of the second concentrated liquid pipe is communicated with a second membrane filter, and a clear liquidoutlet of the second membrane filter is communicated with the raw material tank; a clear liquid outlet of the first membrane filter is communicated with a clear liquid tank for storing clear liquid;the device further comprises a mixing unit, a liquid inlet of the mixing unit is communicated with the clear liquid tank, and a liquid outlet of the mixing unit is communicated with a fixed bed reactor. The hydrogen carrying capacity of the hydrogen-containing residual oil is high, the quality of the hydrogen-containing residual oil is stable, a stable catalytic hydrogenation effect can be obtained under the conventional relatively fixed liquid-phase catalytic hydrogenation condition, the production efficiency can be improved, and a hydrogenation product with lower impurity content and qualified quality can be obtained.