For the existing reinforced concrete structures with crack damage in coastal areas, its chloride diffusion performance under drying-wetting cycles is very important for the durability design and evaluation of the structure. In this paper, a theoretical model of chloride convection-diffusion in concrete structures with non-penetrating cracks under drying-wetting cycles was established by Laplace transform method in this paper. Subsequently, the chloride transport experiments were conducted on cracked concrete structure under the action of drying-wetting cycles. The influence of crack width and crack depth on the distribution pattern of chloride ions was analyzed. Statistical analyses were performed on the surface chloride content and the depth distribution of the convective zone under different crack characteristics. Finally, the theoretical model was validated. The results show that there is a linear relationship between surface chloride content and crack width, and its linear slope increases with the increase of crack depth. When the crack depth is 40mm, 60mm and 80mm, the functional relationship between the crack width and the depth of the convection zone is quadratic function, linear function and logarithmic function respectively. Compared to existing theoretical models, the accuracy of the theoretical model proposed in this study has been improved by 11%, thereby validating its correctness.