Abstract: This study performs a numerical simulation and analysis of tidal currents in the adjacent waters of Cook Strait using the Finite-Volume Community Ocean Model (FVCOM), a three-dimensional finite-volume hydrodynamic ocean numerical model. At the same time, the tidal level data of the tidal station and its tidal harmonic analysis data are collected to compare and verify the model results. The results reveal significant tidal discrepancies on both sides of Cook Strait. On the north side, the amplitude gradually decreases from the New Zealand coast to the Tasman Sea, and on the south side, the amplitude gradually increases from the southern wide sea area to the southern coastline of New Zealand. The tidal process in this area is greatly affected by topography and coastline. This typical reciprocating flow exists in the central part of Cook Strait, and mainly flows southward. The presence of uplift topography and trenches on the south side of Cook Strait is an important influence on tidal processes in the area beyond the strait, as evidenced by the significant increase in tidal current velocities and change in current direction in the uplift region in the southern ocean. By comparing with the measured data, the numerical simulation results of this study are basically consistent with the measured data, which can accurately simulate the hydrodynamic conditions in the adjacent sea area of Cook Strait and provide important experimental basis for related marine engineering construction and scientific research.