Abstract: Non-contact mechanical seals are commonly used in gear boxes. In order to minimize the risk of oil leakage, it is often necessary to design a specialized groove structure in the corresponding area, which would significantly increase the processing complexity and difficulty. By using the example of processing technology for an end-shaped groove, the structural characteristics and key points of processing are analyzed in this paper; then the processing difficulties are effectively solved and the processing efficiency is improved through the design of process flow and special tools. The application example demonstrates the effectiveness of machining routes and cutting tools, providing valuable insights for machining the end-shaped grooves.