Flame retardant masterbatch is based on Flame Retardant on the organic combination of various flame retardant composition modification and synergistic effect, and through the double screw or three screw extruder after mixing, extrusion, a granular product prepared by granulation. Flame retardant belongs to flame retardant additive, and flame retardant masterbatch is flame retardant material containing flame retardant. The flame retardant masterbatch in plastics used in flame retardant efficiency, environmental protection, improve production efficiency, convenience and other aspects of the advantages it has become an effective alternative to conventional flame retardants were all granulation, widely used in plastic extrusion, injection molding etc..