发明了一种片状团聚态小球形纳米WO₃粉末的制备方法。该WO₃复合粉末制备方法包括：将偏钨酸铵和氧化石墨溶液经过混合搅拌后真空放置一段时间，继而用液氮速冻、冷冻干燥，最终空气锻烧得到片状团聚态小球形纳米三氧化钨粉末。发明的优势在于粉体形貌独特，粉末粒度均匀，原料易得，工艺简便，操作简单、过程可控、产物稳定等。制得的纳米小球形的WO₃颗粒均匀排布成大片状，具有极为优异的光催化性能。

A preparation method of flake agglomerated small spherical nano WO₃ powder is invented. The preparation method of the WO₃ composite powder includes: mixing and stirring the ammonium metatungstate and graphite oxide solution, placing it in vacuum for a period of time, then quick freezing with liquid nitrogen, freeze-drying, and finally air calcination to obtain flake agglomerated small spherical nano tungsten trioxide powder. The invention has the advantages of unique powder morphology, uniform powder particle size, easy availability of raw materials, simple process, simple operation, controllable process, stable product, etc. The prepared nano small spherical WO₃ particles are evenly arranged into large pieces, which has extremely excellent photocatalytic performance.