The invention discloses a preparation method of a novel high-strength and high-toughness polypropylene multi-layer material, and is characterized in that the high-strength and high-toughness polypropylene multi-layer material is formed by alternately stacking polypropylene reinforcing layers and polypropylene toughening layers, and two phases show a special double-continuous structure. The reinforcing layers can be a pure polypropylene material containing oriented crystals, or a polypropylene material filled with a reinforcing phase; the toughening layers are a pure polypropylene material which contains a beta-crystal structure growing perpendicular to a layer interface. The method solves the problems that an ordinary preparation process cannot simultaneously prepare a large number of oriented crystals and beta crystals, and cannot realize self reinforcing and self toughening effects of polypropylene at the same time. The method has the advantages of simple operation, continuous production, high production efficiency, and wide industrialization and market prospects.