The invention relates to a reaction tail gas treatment method and belongs to the technical field of recycling volatile gas from tail gas. The reaction tail gas treatment method comprises first-stage absorption, N-channel intermediate absorption and lye absorption. After the tail gas undergoes the first-stage absorption, a generated liquid material undergoes removal of SO2 (g) to form a saturated solution of hydrogen chloride; the intermediate absorption takes ethyl acetate as an absorbent, and recycling liquid is generated; the tail gas containing no HCl (g) is sent into alkali liquor to be absorbed, SO2 (g) in the tail gas is converted into sodium sulfite solution, and the tail gas is discharged directly. The reaction tail gas treatment method is applied to the regeneration and treatment of exhaust gas containing hydrogen chloride and sulfur dioxide, and has the advantages of high removal efficiency and stability in removal.