Ultrafine tungsten powder preparation method with low energy consumption

The invention relates to the technical field of tungsten processing, and discloses a low-energy-consumption superfine tungsten powder preparation method which comprises the following steps: S1, in a down-hydrogen reduction stage, tungsten oxide is fed into an outer furnace tube from the furnace end of a rotary furnace, the outer furnace tube inclines downwards and rotates, dry hydrogen is continuously introduced from the furnace end, and the flowing directions of the hydrogen and the tungsten oxide are controlled to be the same; s2, a reverse hydrogen reduction stage: a tungsten intermediate product generated by the reaction in the cis-hydrogen stage passes through a cis-reverse hydrogen convergence point and then is led to a high-temperature reduction zone of the rotary furnace, and the flow directions of hydrogen and the tungsten intermediate product are controlled to be opposite in the process; the tungsten intermediate product is subjected to a reduction reaction in a high-temperature reduction area in a