Airflow screening ultrafine powder preparation machine

The utility model discloses an airflow screening superfine powder preparation machine which comprises a feeding hopper, a powder screening mechanism and a temporary powder storage tank, the powder screening mechanism comprises a first-stage powder screening tank, a second-stage powder screening tank and a third-stage powder screening tank, and the discharging end of the feeding hopper is connected with the feeding end of the powder screening mechanism through a pipeline; the discharging end of the powder screening mechanism is connected with a temporary powder storage tank through a pipeline, a vacuum pump is arranged on the temporary powder storage tank and used for creating a negative pressure environment, so that tin powder can enter the temporary powder storage tank step by step from a feeding hopper, and the first-stage powder screening tank, the second-stage powder screening tank and the third-stage powder screening tank are the same in structure and are connected step by step through pipelines. Through