The invention relates to a device and method for producing sodium bisulfide by utilizing refinery dry gas. Aiming at the gas composition characteristics of the refinery dry gas, the dry gas refining desulphurization process is processed by utilizing an ultra-high gravity technology, and H2S in acid tail gas after dry gas refining desulphurization is selectively removed, so that the content of the purified H2S is over 99 percent, the purified and refined H2S is absorbed for preparing high-purity NaHS by adopting a continuous alkali liquor cycle, the concentration purity is over 42 percent, the process technology is greatly innovated, the investment is saved, secondary pollution is avoided, a process of a traditional out-dated NaHS product can be replaced, the device has a certain economic benefits and high-efficiency resource utilization rate, the H2S in the acid gas is almost recycled completely, the requirements of environment friendliness and emission are met, high social benefits are achieved, and recycling comprehensive utilization of refinery acid tail gas is realized.