The invention discloses preparation processes of zirconium tetrachloride and zirconium dioxide. The preparation process of zirconium tetrachloride comprises the following steps that 1, zircon sand, acarbon reducing agent and chlorine are added into a primary fluidizing chlorination furnace, heating is performed, primary chlorination reaction is performed to generate zirconium tetrachloride, silicon tetrachloride, carbon monoxide and carbon dioxide, and a first gas mixture is obtained; 2, the carbon monoxide is separated from the first gas mixture and is introduced into a secondary fluidizingchlorination furnace, the zircon sand and the chlorine are added into the secondary fluidizing chlorination furnace, heating is performed, secondary chlorination reaction is performed to generate zirconium tetrachloride, silicon tetrachloride and carbon dioxide, and a second gas mixture is obtained. The primary chlorination reaction and secondary chlorination reaction in the process can promote reaction of CO serving as a reducing agent, the CO having reducing potential and produced by the primary chlorination reaction can be fully and effectively utilized by coupling the primary chlorinationreaction and the secondary chlorination reaction, the input of reaction raw materials in the whole process is reduced, accordingly the production cost is reduced, and discharge of greenhouse gas is decreased.