Prestressed cables are widely used in bridges and some large building structures. HDPE is commonly used as the outer sheath of cables and is an important protective layer for cables, playing a protective and anti-corrosion role, directly affecting the safe use of bridges and the lifespan of cables. The wear durability of HDPE was explored through fatigue wear performance tests of prestressed cables and steering gear, as well as friction loss tests with large sliding distances. The former focuses on micro vibration wear and conducts 2 million pulse vibration slip tests under bending stress and deflection stress to detect the degree of HDPE wear; The latter tests the friction rate between the steering gear and the HDPE sheath of the steel strand, simulating the actual force conditions, for vibration wear with a large sliding distance. Both sets of test results indicate that the wear rate of HDPE is very low, indicating that it has sufficient wear durability and can meet the general usage requirements of bridge cables. The test results can provide a certain reference for determining the design service life of bridge cables