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This invention belongs to the field of polyurethane technology, specifically relating to rigid polyurethane foam materials for high-temperature resistant pipelines and their preparation method. The polyurethane foam is made from component A and component B in a mass ratio of 100:(130~150). Component A includes the following raw materials by mass percentage: polyether polyol A: 7~36%; polyether polyol B: 13~35%; polyether polyol C: 13~37%; catalyst: 3~8%; additives: 3~14%; dispersant: 0.3~4.2%; foam stabilizer: 1.3~2.5%; pentane blowing agent: 6~15%. Component B is polymethylene polyphenyl isocyanate. By using specific polyether blends, adding nano-zirconia and dispersants, and optimizing the ratio of component A to component B, the high-temperature resistance, compressive strength, and dimensional stability of the polyurethane foam are significantly improved, making it suitable for the preparation of pipeline insulation materials.