Abstract: In an industrial purple nano-needle tungsten oxide preparation method, ammonium paratungstate 5(NH4)2O.12WO3.5H2O, tungstic acid mWO3.nH2O (m?1, n?1), or tungsten oxide WOx (2?x?3) is used as a raw material for preparing the purple nano-needle tungsten oxide in an inclined rotating furnace pipe. At an inlet of the furnace pipe, the raw material is pushed from a feed inlet of a feeding device into the heated furnace pipe. The inclined furnace pipe is rotated to gradually move the raw material from a low temperature area to a high temperature area. The raw material at the high temperature area inside the furnace pipe is reduced by H2 to form the nano-needle purple tungsten oxide. The inclined furnace pipe is rotated to move the WO2.72 towards a discharging end, and the purple tungsten oxide WO2.72 is discharged from a discharge outlet of a discharging device and cooled to room temperature by the discharging device.