The invention relates to a technology for printing different interlayer colors through 405nm digital light processing (DLP), and belongs to the technical field of 3D printing. The technology particularly comprises the steps that a product model is created by utilizing drawing software, and a .stl data model file is generated; the .stl data model file is imported into Dolphin Studio slicing software, slicing processing is conducted on the data model according to the set thickness of each layer, and a .3dp printing track file is generated; the .3dp printing track file is imported into a DLP printer, photosensitive resin is added into a resin tank of the DLP printer, printing parameters are set, printing is started, in the printing process, different pigments are intermittently and quantitatively added and uniformly stirred through a pigment adding, mixing and stirring device, the color of the photosensitive resin is adjusted to a set color, and then printing is continued; and finally, aproduct with different interlayer colors is printed. According to the technology, operation is easy, use is convenient, different colors can be printed according to needs, and personalized requirements are met.