The powder screening assembly uses materials (powder) smaller than the screen gap to pass through the screen gap and fall to the lower layer for filtration, and then flows out from the lower box to achieve the purpose of conveying and screening. The equipment has a simple structure, convenient installation and maintenance, and has dust removal points connected to the dust removal pipeline, without dust overflow. It can be installed and placed in front of the cooling equipment for secondary filtration to avoid excessive powder causing loose casting shape and affecting production.