For the construction of offshore photovoltaic fields in ultra-shallow water, tidal level prediction is required to ensure the safety of construction vessels and the smooth progress of the project. In this study, continuous tidal level observations were conducted for over three months at the HG14 offshore photovoltaic field off the Yellow River estuary. Based on the measured tidal data, tidal harmonic analysis was performed, and tidal harmonic analysis prediction at the observation station was conducted. Numerical prediction of tidal level was conducted based on the establishment of the hydrodynamic model of the Bohai Sea and validation of the model. The measured data of the tidal level indicate that the tides in the photovoltaic field are irregular semi-diurnal mixed tides, with significant diurnal inequality and maximum tidal range of approximately 2.0 m. Harmonic analysis of the 11 major tidal constituents indicates that their amplitudes from large and small are M2, K1, O1, S2, K2, P1, N2, M4, Q1, MS4, and M6, with respective amplitudes of 62.28, 26.27, 22.06, 20.87, 7.49, 6.64, 6.36, 5.11, 4.28, 1.47, and 0.65 cm. The amplitude of M2 is 62.28 cm, approximately 2.37 times that of the second-largest constituent K1 (26.27 cm). The amplitude of the semi-diurnal constituent S2 is 20.87 cm, which is smaller than those of the diurnal constituents K1 and O1. Among the three shallow-water tidal constituents, M4 is the largest, while MS4 and M6 are significantly smaller than M4. After obtaining the harmonic constants of the major tidal constituents, harmonic analysis tidal predictions were conducted at the observation station. The results show that the consistency between the harmonic analysis predicted tidal level and measured tidal level is very good. The technical scores of the predicted tidal level by harmonic analysis and the numerical simulated tidal level between the measured tidal level are 0.96 and 0.97, respectively, and both can predict the tidal level with high accuracy. The validated numerical model was applied to simulate and predict tidal levels at the model output point in the photovoltaic field. Temporal variation figures of tidal level and tide tables in each month were presented. The diurnal inequality in the photovoltaic field is particularly distinct during neap tides, with low tide levels noticeably higher than those during spring tides. The tide tables provide hourly tidal levels for each day at the output point in three dates of Gregorian, lunar, and weekday, as well as the two daily high- and low-tide levels and their corresponding times. This study indicated the tidal characteristics in the offshore photovoltaic field HG14. The predicted tidal levels can provide scientific guidance for construction vessels to avoid shallow grounding.