Disclosed is a polypropylene composition, comprising the following components in parts by weight: 40-55 parts of co-polypropylene resin, 0-10 parts of low-density polyethylene resin, 5-20 parts of ethylene-octene copolymer and 25-35 parts of talcum powder. The molecular weight distribution of the co-polypropylene resin is ≤4.5. The polypropylene composition according to the present invention adopts the co-polypropylene resin having a narrow molecular weight distribution, the content of low-molecular-weight polypropylene in co-polypropylene may be effectively reduced, a polypropylene polymer crystallization tendency can be weakened, and a linear expansion coefficient of a polypropylene material may be reduced. In addition, raw materials may all be fed by using a main feeding port; and the present invention may be applied to a polypropylene tailgate of a vehicle and a polypropylene fender outer plate, contributing to the cause of vehicles becoming lightweight.