Xinjiang, as the key node of "power transmission from West to East" in China, has a large power grid coverage area. Affected by the bad weather in Xinjiang, the electric power fittings subject to conventional treatment failure prematurely during service. In order to further improve the service life of fittings, laser hardening is used to improve the surface wear resistance of the material, and the effect of laser hardening treatment on the microstructure and hardness of the U-ring is studied. According to the actual working conditions of U-rings, the wear test is carried out and the wear results are analyzed. Finally, the residual loading capacity of the worn U-ring is tested. The results show that the microstructure of laser hardened layer is needle-like and lath martensite, the average hardness of the hardened layer is 638 HV, and the depth is about 2.1 mm. The average wear mass of the unstrengthened U-ring in group one is 19.8 g, and the average wear mass of the laser-strengthened U-ring in group three is 0.9 g, the mass loss of laser-strengthened U-ring is 4.5% of the unstrengthened U-ring. According to the failure load test, the residual loading capacity of laser hardening U-ring is still higher than its nominal failure load.