Clean production process of sulfur-containing silane

The invention belongs to the technical field of sulfur-containing silane production, and particularly relates to a clean production process of sulfur-containing silane, which comprises the following steps: step S1, synthesizing mercaptopropyltriethoxysilane; s2, reacting the obtained mercaptopropyltriethoxysilane liquid with an iodine solution and a carbon tetrachloride solution of iodine in a reaction tower, and discharging hydrogen iodide generated by the reaction from the top end of the reaction tower; and S3, after the reaction is finished, feeding a liquid product and unreacted mercaptopropyltriethoxysilane mixed solution into a vacuum rectifying tower from the bottom of the reaction tower through a pump, separating to obtain a qualified Si-75 product, and recovering unreacted mercaptopropyltriethoxysilane to return to the reaction tower. The raw material cost is reduced through cyclic utilization, the variety of materials in the process is very few, and the problem of using and treating solid materials