Used in the injection molding industry for automatic proportional mixing masterbatch industrial equipment, metering masterbatch mixer is suitable for the automatic proportional mixing of new materials, secondary materials, masterbatch or additives, etc. The metering masterbatch model uses imported DC brushless motors, based on the pre-set proportional mixing, and through the full digital micro-computer control system to set the conditions for automatic conversion into rotational speeds to directly drive a precision screw to extrude the raw materials.