Offshore discarded platform piles removal wire saw is a new underwater work tools which is developed in recent years. Its main structure includes the wire saw body and a hydraulic control system, the clamping teeth of clamping flap can make wire saw safely and stably work. Clamping teeth structure was described, the optimization mathematical models of clamping tooth size and tooth transition curve were obtained by analyzing, and the clamping tooth key optimization parameters were derived using the finite element method. Clamping teeth was designed and manufactured according to the optimization results. The experiment result shows that the clamping teeth is able to meet the requirements, which lays foundation for the security and stability of the wire saw.