The invention relates to a DCS control method of an acid making process in hydrogen chloride production. In hydrogen chloride production, hydrogen chloride gas produced by a synthetic furnace is guided out via a hydrogen chloride outlet from the bottom of a cooler of the synthetic furnace and then enters a hydrogen chloride distribution table, a DCS control approach is adopted for an acid making process based on hydrogen chloride, and a one-key acid making start button is set on a display device of an hydrogen chloride DCS control system operator station. The invention provides a DCS control method of a one-key automatic acid making process in hydrogen chloride production. The method has the advantages of simple operation, high degree of automation, high safety coefficient, and good stability. Automatic control of an acid making process based on hydrogen chloride is truly realized. The labor intensity and the production cost are reduced.