Offshore discarded platform piles removal wire saw is a complex electromechanical equipment, selection of clamping force is directly related to the security and stability of the wire saw. Section bending moment and deformation amount of pile clamping were analyzed, and discard pile platform instability critical load calculation method were derived. Clamped pile deformation and stress were analyzed by using the finite element method (FEM). Clamping forces under different destabilizing critical condition were solved using the nonlinear model. The experiment shows wire saw clamping force can ensure its safety to satisfy pile different destabilizing critical condition. The results lay a certain foundation for the wire saw reliability underwater work.