In the upgrading and reconstruction project of a celled steel sheet pile wharf,the depth of the sheet pile in front celled wall is changed after dredging the front basin,which affects the stability of the wharf structure.In order to explore the stability and failure mode of celled steel sheet piles after renovation,we use the finite element software MIDAS GTS to build a three-dimensional finite element numerical model suitable for the structural stability analysis of celled steel sheet piles.By comparing and analyzing the deformation,stress and overall stability of celled steel sheet piles before and after renovation under the most unfavorable working conditions,we propose a celled steel sheet pile wharf renovation scheme combined with composite foundation treatment and anti-slide pile reinforcement.The results show that the overall deformation,soil pressure distribution,structural internal force distribution,and subgrade reaction distribution of celled steel sheet piles before and after wharf reinforcement are basically the same