The invention discloses a method for preparing a zirconium oxide metering nozzle. According to the method, yttrium oxide-stabilized zirconium oxide is used as aggregate, zirconium hydroxide nanogel is used as additive, monoclinic zirconium oxide micro powder is used as dispersing agent, the additive and the dispersing agent are mixed to prepare co-grinding powder, and the aggregate and the co-grinding powder are mixed and subjected to ageing molding and then fired in an electrical kiln which is 1630-1650 DEG C, so that the zirconium oxide metering nozzle is obtained. The nanometer zirconium hydroxide gel prepared with the sol-gel method is used as the additive, the monoclinic zirconium oxide micro powder is used as the dispersing agent, the nanometer zirconium hydroxide gel and the monoclinic zirconium oxide micro powder are mixed and co-ground, particle aggregation during degumming, drying and light roasting is avoided, and it is guaranteed that particles are of nanoscale. The particles and the co-grinding powder are blended, mixed, aged, molded and finally fired in the electric kiln. Due to the fact that the added nanometer zirconium hydroxide is small in size and high in dispersity and can be decomposed into high-activity zirconium oxide at a low temperature, firing temperature is reduced by about 80 DEG C, and the service life of a heating element of the electric kiln is prolonged greatly.