The invention relates to a treatment method of acid water head space gas. The treatment method comprises the following steps of: (1) collecting acid water head space gas; (2) introducing the collected acid water head space gas into an alkaline liquor desulfurizing device to remove sulfur-containing pollutants; and (3) feeding sulfur-removed waste gas into an oxygen removing device for removing oxygen therein, and feeding into a low-pressure gas pipe network of a refinery. Compared with the prior art, the treatment method has the advantages of simple entire process flow, low personnel management cost, no discharge of waste water or waste gas, direct feeding of waste residues into an alkaline residue treatment device in a factory, no increase in treatment cost, avoidance of secondary pollution and small device floor area.