Abstract: To quantify the impact of high-strength steel on the overall buckling behavior of welded box section axially compressed members, experimental method and numerical simulation method were used to study the buckling behavior of Q420 to Q960 steel welded box section axially compressed members. The results show that with the increase of the steel strength and slenderness ratio, the proportion of elastic buckling in the overall buckling process increases, and the influence of initial geometric imperfections on the overall buckling bearing capacity first increases and then decreases. For the same slenderness ratio, there is no monotonic relationship between the overall buckling factor and steel strength. However, the overall buckling factor increases with the steel strength, especially in medium-length members. The calculation methods in European, Chinese, and American codes underestimate the overall buckling bearing capacity of high-strength steel welded box-section axially compressed members, with the conservatism increasing with the steel strength. A correction formula for the overall buckling bearing capacity considering the influence of steel strength was proposed.