High-precision tidal level data serves as a critical foundation for marine scientific research and engineering applications. With the expansion of modern marine activities, the demand for offshore long-distance tidal level information continues to grow. To further advance the acquisition of offshore high-precision tidal level data, this study conducted feasibility testing, accuracy research, and attitude compensation impact analysis for single-Beidou buoy tidal level measurement based on network RTK technology. Experimental results indicate: regarding elevation, incorporating attitude compensation effectively reduces errors and enhances measurement accuracy. Without attitude compensation, the maximum absolute error in tide level measurement was 4.10 cm, with an average deviation of 1.34 cm and a standard deviation of 1.54 cm, achieving an accuracy of 1.96 cm. With attitude compensation applied, the maximum absolute error decreased to 3.30 cm, the average deviation reduced to 1.14 cm, the standard deviation decreased to 1.44 cm, and the accuracy improved to 1.75 cm. Regarding phase, the overall phase lag variation remained within 4°. Adding attitude compensation showed no significant effect on improving phase shift. Therefore, a single-Beidou buoy based on network RTK demonstrates certain feasibility for tide level measurement. In fields such as smart waterway construction and hydrographic surveying, a single-Beidou tide gauge buoy based on network RTK holds promising application prospects.