The invention provides a transporting method for lightweight and non-flow ultrafine powder. According to the transporting method, the powder in a powder storage tank is sprayed through a liquid solvent, the volume of the moist lightweight ultrafine powder decreases rapidly, suspension liquid is formed, then flushed into a transporting pipeline, and enters target equipment through the transportingpipeline, and the automatic closed conveying purpose of the ultrafine powder material is achieved. By means of the novel transporting method for the lightweight and non-flow ultrafine powder, the conveying process greatly reduces the volume of the lightweight ultrafine powder, the problem of the poor powder fluidity is solved, the powder forms the suspension fluid, while the volatile solvent is used so as to conveniently reduce turbid liquid into the dry powder, the conveying process can realize closed automation, and the whole process is clean, efficient, repeatable, automated, safe and reliable.