The metered Color Masterbatch mixer can automatically mix 1 main material and 1-4 color masterbatches or additives of plastic raw materials in proportion. It is suitable for injection molding, extrusion or blow molding production. This series of products adopt hybrid stepping motor and special microcomputer controller, which can accurately measure the addition proportion of color masterbatch and additives. The mixer can be connected with various molding machine signals and then run synchronously to ensure the consistency of the performance of molded products.