本发明公开了一种高抗冲聚丙烯接枝聚合物及其制备方法,属于高分子材料技术领域。其特征在于:高抗冲聚丙烯接枝聚合物中含有交联“橡胶相”结构,这种结构的聚丙烯接枝聚合物的冲击强度高,且能保持原材料的拉伸强度。该聚合物通过水相悬浮接枝工艺制备,在接枝反应中,交联单体与接枝单体在聚丙烯基体上发生交联共聚合,形成的交联共聚物作为“橡胶 The invention discloses a high-impact polypropylene graft polymer and a preparation method thereof, belonging to the technical field of polymer materials. The invention is characterized in that the high impact polypropylene graft polymer comprises a cross-linked ”rubber phase" structure. The polypropylene graft polymer with the structure has high impact strength and can maintain the tensile strength of the raw material. The polymer is prepared by aqueous suspension grafting process. In the grafting reaction, the crosslinking monomer and the grafting monomer are cross-linked and copolymerized on the polypropylene substrate to form the cross-linked copolymer as a rubber