Abstract: Disclosed is a method for testing quality of powder spreading, including: illuminating, after a powder spreading apparatus completes spreading of a single layer of powder, a forming area successively and separately by light sources, and performing photographing twice to obtain two images of powder spreading; synthesizing the two images of powder spreading; determining an overall gray scale of the synthesized image, and if the overall gray scale is consistent, the powder spreading being successful, and if not, processing the synthesized image by using a method of gray scale threshold segmentation, and marking an area contained in a contour boundary inside the synthesized image as a suspected defect area; and determining whether the powder spreading is successful according to a gray scale value. Also disclosed is a device for testing the quality of powder spreading. The present application realizes a function of testing the quality of powder spreading.