In order to study the mechanical properties of reinforced concrete columns with lithium slag, a numerical simulation of 14 reinforced concrete columns with lithium slag was carried out based on ANSYS finite element software, and the simulation results were compared with the test results.The failure modes, material stressstrain nephogram, ultimate bearing capacity and load-deflection curves were studied.The effects of the content oflithium slag and eccentricity on the mechanical properties of uncorroded components and the effects of acid raincorrosion time and the content of lithium slag on the mechanical properties of corroded components were discussed.The results show that for the non-corroded members, the influence of different lithium slag content on thesmall eccentric members is more obvious, and the influence of different eccentricity on the bearing capacity andstiffness of members is very significant; and in a certain range, the ultimate bearing capacity of the column canbe improved by adding lithium slag. For corroded members, the addition of lithium slag can improve the bearingcapacity and lateral stiffness of the corroded column to a certain extent, and the ultimate bearing capacity of thecolumn decreases with the increase of corrosion time. The addition of lithium slag can delay the influence ofcorrosion time on the bearing capacity to a certain extent.