The invention belongs to the field of craft processes of arene production devices, and particularly relates to a device and method of preparing paraxylene by alcohol/ether conversion. The device provided by the invention mainly consists of an alcohol/ether aromatization reaction device, a gas-liquid-liquid three phase separating device, a benzene fractional device, a paraxylene fractional device, an olefin-removing device, a paraxylene separating device and a paraxylene product tower. The yield of the paraxylene is increased by means of aromatization reaction of non-arene, alkylation reaction of benzene and disproportionated reaction of xylene and arene with more than 9 carbon atoms. By adopting an unclear separation technology of a product with less than 7 carbon atoms, an arene extraction device is canceled, the investment and energy consumption are greatly reduced, and gaseous phase hydrocarbon with more than 2 carbon atoms is fully utilized as a raw material of an alcohol/ether aromatization device. Hydrogen generated is used for disproportionation of C9 methyl arene and C10 methyl arene and isomerization reaction of C8 arene. The device and method have the advantages of self supply of raw materials, less investment, low energy consumption, short flow and high yield of paraxylene.