Device capable of continuously preparing COS and use method thereof

The invention discloses a device system capable of continuously preparing COS and a using method thereof.The system comprises a CO gas source pipeline, a CO purifier, a CO heating device, a sulfur feeding device, a sectional type heating sulfur melting kettle, a COS synthesis catalytic reactor and a sulfur recycling device.When the system is used, after CO gas is dehydrated and purified, the CO gas is heated to 400-500 DEG C through the CO heating device, and then the CO gas is heated to 400-500 DEG C through the sulfur feeding device; the method comprises the following steps of: introducing CO gas into a molten sulfur liquid to take out CO mixed gas containing sulfur steam, reacting under the action of a catalyst to synthesize high-concentration COS gas, and cooling and recycling sulfur steam which is not completely reacted into a sulfur feeding device for recycling. According to the invention, through sectional heating, sulfur steam required by COS reaction can be continuously generated, and the reaction fo