The invention belongs to the technical field of chemical industry production, and in particular relates to a method for producing thionyl chloride. The method comprises the following steps: sulfur dioxide gas and synthetic gas generated by reaction of sulfur and chlorine gas in a synthesis reactor enter a reactor together, the crude product thionyl chloride in a gaseous form generated by reaction in the reactor directly enters a rectifying tower through an absorbing tower; the gas phase at the top of the rectifying tower enters a reflux drum after condensation; the gas phase in the reflux drum enters an evacuated drum through an ejector, and then is cyclically nested back to the synthesis reactor; and a qualified product is obtained in the middle part of the rectifying tower. According to the method for producing thionyl chloride, because the process pipeline is short and a process of condensing regasification is saved, heat in the system can be utilized more sufficiently, and the energy consumption of devices is greatly reduced.