The anchor cable grouting stopper used in the foundation pit (slope) support project of the core business street in Wuxiang New District, Nanning, has the characteristics of large grouting hole diameter and high grouting pressure, which makes it difficult to connect the stopper with the anchor cable body. The existing anchor cable grouting stopper structure is difficult to meet the requirements of this project. In order to ensure the smooth implementation of the project, a grouting stopper was designed according to the characteristics of this project. Its performance was verified through experiments, which can solve the technical problems of this project and can be widely used in engineering.