Conventional leak sealing materials are often difficult to balance the structural characteristics of deformability and high pressure, resulting in poor particle size matching and pressure sealing effects. Although existing shape memory sealing materials can deform at activation temperature and achieve adaptive sealing of cracks, they have problems such as low activation temperature and insufficient compressive strength, making it difficult to cope with harsh temperature and pressure environments in deep geological conditions. This study selected epoxy resin monomers and developed foam resin materials with high activation temperature and good shape memory performance through the optimization of curing agents. The pressure sealing performance and wall strengthening effect were systematically evaluated. The evaluation results indicate that the prepared shape memory foam sealing material has a glass transition temperature of 97 ℃ and has a good sealing effect on natural crack leakage. The use of high activation temperature shape memory foam material to prepare leak stopping fluid can be applied to the sealing of fractured leak stopping wellbore walls, which has great significance in broadening the safety density window, reducing accidents and complexity.