The invention provides an electron-grade hydrochloric acid production method. The electron-grade hydrochloric acid production method sequentially comprises the following steps that 1, synthesized hydrogen chloride gas enters an adsorption tower so as to remove free chlorine; 2, a reagent-grade hydrochloric acid solvent is adopted to enter a washing tower from the inlet in the upper part of the washing tower to wash the adsorbed hydrogen chloride gas so that soluble impurities can be removed; 3, the washed hydrogen chloride gas passes through first condensation and secondary condensation and enters a demister so as to remove mist, so that high-purity hydrogen chloride gas is obtained; 4, high-purity hydrogen chloride is absorbed by a first and a secondary falling film absorber and a tail gas absorbing tower, and then passes through a hyrochloric acid cooler, so that a finished product is obtained; 5, absorbant water adopts hyperpure water; and 6, the finished product obtained in the step 4 enters a finished product storage tank, and is ultrafiltered to remove particulate impurities, so that electronic hydrochloric acid is obtained. The electronic hydrochloric acid production methodhas the characteristics of simple technology, continuous production, good stability,simple equipment, and the like.