The invention discloses impact resisting weather-proof polypropylene and a preparation method thereof. The impact resisting weather-proof polypropylene comprises the following components in percentage by weight: 55-78 percent of polypropylene, 5-15 percent of polyethylene, 15-30 percent of filler, 0.2-1.0 percent of antioxygen, 0.2-1.0 percent of light stabilizer and 0.2-1.0 percent of coupling agent. The obtained polypropylene material has excellent liquidity as well as excellent impact performance and weather resistance.