The invention provides a heat-resisting and anti-impact PPR (Polypropylene Random) pipe and a preparation method thereof and belongs to the technical field of PPR pipes. The heat-resisting and anti-impact PPR pipe is prepared from the following raw materials in parts by weight: 90-120 parts of polypropylene randon coplymer, 10-20 parts of low-molecular-weight polybutylene, 20-30 parts of hydrotalcite and 0.8-1.5 parts of an antioxidant, wherein the number mean molecular weight of the low-molecular-weight polybutylene is 2300-2550. The heat-resisting and anti-impact PPR pipe provided by the invention has good strength and heat resisting performance, and the low-temperature fragility is also improved. Furthermore, the invention relates to the preparation method of the heat-resisting and anti-impact PPR pipe.