Offshore Pile platform leveler is a kind of sophisticated underwater machinery, pile platform need to be leveled in the installation process, its clamping workload often reaches several thousand tons. Pile platform leveler system architecture was introduced. Its mechanical models of upper and lower clamping mechanism were analyzed. The deformation and stress of pile catheter and Spud skirt sets were analyzed by using the finite element method (FEM) when clamping block works. A pile leveler experimental system was established, leveling working process was verified, the clamped deformation stress characteristics of catheter and Spud skirt sets were acquired, and the results were basically consistent with the theoretical analysis. The results provide certain theoretical foundation for the pile platform leveler clamping device of optimization design.