Disclosed is a method and apparatus for producing sodium hydrosulfide, comprising the following steps: transferring H₂S from acid gas into low-temperature diesel oil to obtain rich absorption oil, then using a NaOH solution to perform an acid-base neutralization reaction with the rich absorption oil to remove H₂S, followed by oil-water separation, with the aqueous and oil phases being recycled. The invention utilizes low-temperature diesel oil to absorb the heat generated by the acid-base neutralization reaction. The acid-base neutralization reaction itself serves as the regeneration process of the absorbent, eliminating concerns about excessive local heat from the reaction causing excessive water evaporation and subsequent salt crystallization, which could clog pipelines or reactors.
