Uplift bearing capacity is an important part of pile foundation design. In ocean engineering, there is a growing demand for piles that have enough uplift bearing capacity for construction in offshore wind farms. The method for calculating the uplift bearing capacity of pile foundations given in current codes is rooted in the modification of the compressive bearing capacity of pile foundations, and the theoretical research is limited to semi-empirical and limit equilibrium methods. Therefore, there is big difference between calculated and measured values. This paper systematically explains the current calculation methods for the uplift bearing capacity of pile foundations, then uses different methods combining them with practical projects. The results show that:the uplift bearing capacity calculated by the method given in the API code is closer to the measured value in clay; the Meyerhof and Das algorithms are ideal for uplift piles with a small length-diameter ratio; and Chattopadhyay and Shanker's algorithms are suitable for piles in sand. We also found that the current methods for calculating uplift capacity ignore the adhesion force and negative pore water pressure, resulting in great differences between calculated and measured values.