Composite modified polypropylene material and preparation method thereof

The invention discloses a composite modified polypropylene material and a preparation method thereof. The preparation method is characterized by comprising the steps of: adding 100 parts by weight of polypropylene, 1 to 5 parts by weight of composite modified addition agent and 0.1 to 0.5 part by weight of antioxidant to a high-speed mixer; stirring and mixing at the temperature of 20 DEG C to 60 DEG C for 2 to 6 minutes; and granulating by using a twin-screw extruder at the extruding temperature of 170 DEG C to 210 DEG C. The polypropylene prepared by the method has better processing performance, enhances impact strength by 195% and breaking elongation by 277%, and keeps tensile strength unchanged basically.