［Objective］The internal environment of oil pipelines faces the destructive effects of acidic media，high-salinity water，and sand impact simultaneously. Traditional polyurethane coatingsstruggle to balance corrosion resistance and impact resistance.［Methods］To enhance the protective performance of pipelines，a novel anti-corrosion and impact-resistant coating was prepared by utilizinghydroxyl-terminated polydimethylsiloxane（OH-PDMS） to modify polyurethane. The coating was systematically characterized and evaluated by Fourier transform infrared spectroscopy，tensile testing， resilience testing，water absorption rate measurement，hydrolysis weight loss rate measurement， electrochemical impedance spectroscopy and falling sand impact testing.［Results］When the OH-PDMS content was 15%，the coating exhibited optimal mechanical properties，with tensile strength reaching 63 MPa and toughness reaching 316. 4 MJ/m3. After being immersed in sodium chloride immersion for 30 days，the impedance modulus of the coating still maintained 94% of its initial value. In addition，the coating exhibited excellent impact resistance，with wear mass reduced by 42. 3% and minimal surface damage. These improvements are attributed to the microphase separation， hydrophobicity and enhanced energy absorption induced by OH-PDMS.［Conclusion］This coating provides high strength，long-term corrosion resistance and excellent impact resistance in simulatedinternal environments of oil pipelines with sand and high salinity，offering an efficient solution with practical application potential for internal pipeline protection.