The construction of China's submarine tunnels is in full swing, and while promoting the development of transportation and science and technology, it is also facing many challenges. Among them, as one of the key problems facing the construction of submarine tunnels, water seepage and inrush is the focus of many scholars" research. In recent years, the research on the mechanics of high permeability rock has made fruitful achievements in theory and technology, and has been widely used in the prevention and control of water inrush disasters in submarine tunnels. However, due to the complexity of submarine construction conditions, the evolution process of destabilization and damage of peripheral rock in submarine tunnels and the mechanism of water inrush in complex geological tunnels are still unclear, and the method of predicting the risk of water inrush disaster is still imperfect, which seriously restricts the development of the construction of submarine tunnels. The article collates the research results of high osmotic pressure rock mechanics and the application cases of submarine tunnel engineering, summarizes the research progress of the rock from fine fissure expansion to macro fracture process law under high osmotic pressure conditions, and provides a detailed study on the influence of geomechanical parameters on the fracturing mechanism of the water barrier layer under high osmotic pressure, the evolution law of permeability damage of fissured rock, the expansion law of fissure of rock under the dynamic stress, and the visualization and reconstruction of the expansion process of the seepage fissure field. Introducing the theoretical and technical difficulties faced by the construction process of submarine tunnels, such as high osmotic pressure, complex geology and multi-field coupling, reviewing the application of high osmotic pressure rock mechanics in the control of the stability of the surrounding rocks of the submarine tunnels, prevention and control of seepage and water inrush, and the calculation of the thickness of the water barrier layer. It further discusses the application prospect of high permeability rock mechanics in the risk control of submarine tunnel construction, which has certain theoretical and practical significance for the prevention and control of water emergence disasters in submarine tunnels and other underwater projects.