In order to study the effect of corrosion of bridge high-strength steel wire on the performance degradation of sling，taking the sling of an arch bridge that has been in service for 14 years as the research object，the acid salt spray accelerated corrosion test of sling high-strength steel wire was carried out，and six steel wire samples with different corrosion degrees were obtained. Using threedimensional(3D)laser scanning technology，the characteristics of uniform corrosion and pitting corrosion on the surface of corroded steel wire were studied，and the pitting coefficients were introduced to analyze the probability distribution characteristic of local corrosion parameter of sling high-strength steel wire. The results show that the average mass loss rate of steel wire is a power function with time. The coefficient α and β of steel wire pitting can obey the lognormal distribution. The steel wire tend to uniform corrosion with the increase of corrosion level.