The invention discloses a polypropylene-toughening compound material and a preparation method thereof. The polypropylene-toughening compound material comprises the following components in part by weight: 100 parts of isotactic polypropylene and ultrahigh molecular weight polyethylene, 1 to 20 parts of shell micro powder, 0.01 to 2 parts of surfactant and 0.1 to 0.5 parts of antioxidant, wherein the ratio of the isotactic polypropylene to the ultrahigh molecular weight polyethylene is (9: 1)-(1: 1). The preparation method comprises the following steps of: performing surface modification on theshell micro powder; and twice melting and mixing the components according to different blending sequences. According to the invention, the high impact compound material is prepared by modifying the polypropylene by simultaneously using the ultrahigh molecular weight polyethylene and the shell micro powder having a staggered laminated structure. The material can increase the impact strength of thepolypropylene on the premise of no loss of the tensile strength of the polypropylene basal body; moreover, the production process is simple, the production efficiency is high and the production cost is low.