Abstract: Microcapsules are widely used in resin mineral composites to achieve self-healing. The new metallic microcapsules solve the problems of poor mechanical and robustness of traditional microcapsules. However, because the mechanical properties of the interface between the metallic microcapsules and the matrix are unknown, the cracking performance of the metallic microcapsules cannot be determined. As a result, it is difficult to determine the practicability of metallic microcapsules, and thus unable to promote them. To solve this problem, molecular dynamics method was proposed to simulate the damage evolution process of metal microcapsule wall/resin matrix interface, and obtain the interface mechanical properties. On this basis, the cracking performance of metal microcapsules was analyzed by using the extended finite element method and the cohesive force model. The results show that: (1) The damage evolution process of the model can be divided into three processes: Initial deformation, local failure and global failure; (2) The elastic modulus of the capsule wall/matrix interface is 6.458 GPa, and the strength limit is 62 MPa; (3) The metal microcapsules can break after the matrix crack appears, but earlier than the matrix crack reaches the metal microcapsules. The results provide a theoretical basis for the application of this new metal microcapsule.