The invention discloses a method and a device for co-production of zirconium tetrachloride and silicon monoxide. The method comprises the following steps: 1) mixing zircon sand and silicon, heating amixture under vacuum condition, reacting silica in the zircon sand and silicon to form vaporized silicon monoxide, and reacting silica in the zircon sand to remain the solid residue; and 2) mixing thesolid residue and chlorine gas and a carbonaceous reducing agent, heating the mixture, and performing a reaction on zirconia in the solid residue chlorine gas and the carbonaceous reducing agent to generate zirconium tetrachloride. The method of the present invention is heated under vacuum, silica in the zircon sand generates the silicon monoxide, a subsequent exhaust gas separation system can besimplified, a high value-added silicon monoxide product is obtained, the high value utilization of silicon resources in the zircon sand is realized, at the same time, the production process of zirconium tetrachloride is greatly simplified, the production cost is effectively reduced, and the product quality is improved.