The high head water-saving ship lock for tunnel scheme of the Yellow River-crossing engineering can arrange the scattered water-saving pools alternately on both sides of the deep foundation pit，and the backfill behind the lock chamber wall is low and the free height is large. For the problem of the baseplate’s excessive negative moment of the high water head water-saving ship lock chamber in the high-flow period，we propose an integral structure with top-pull high-strength wire rope，use the ABAQUS finite element software modeling analysis to conduct focused research on the function of wire rope in four working conditions of completion period，high water level period，low water level period and maintenance period，analyze the effect of wire rope diameter and pre-stress，and propose a pre-stress estimation method based on unit cable force effect. The results show that the wire rope mainly plays a role during the high-flow period，and the larger the diameter is，the more obvious the effect is. The function of the wire rope can be further enhanced by exerting the pre-stress. The pre-tress estimation formula proposed in this paper is reasonable and feasible.