The invention discloses a production process of a disulphur dichloride impurity-removed ethyl chloride. The process comprises the following steps: (1) taking phosphorus pentasulfide, and leading the phosphorus pentasulfide and the absolute ethyl alcohol to react under the action of a catalyst so as to produce ethyl sulfide; (2) utilizing caustic soda liquid to absorb tail gas hydrogen sulfide produced in step (1) to produce sodium sulfide solution, introducing chlorine gas into the ethyl sulfide, and carrying out chlorination reaction to obtain an ethyl chloride crude product; (3) utilizing water to absorb the produced hydrogen chloride gas to produce hydrochloric acid, and carrying out hydrolysis reaction on the ethyl chloride crude product and sodium sulfide produced in the process of vulcanization reaction to produce the ethyl chloride finished product and less sulphur; and (4) refining the ethyl chloride finished product to obtain the high-purity ethyl chloride refined product. The process of the invention has low cost and high yield.