The wet-type liquid nitrogen cryogenic system is a high-performance low-temperature control device that uses liquid nitrogen as the refrigerant. It achieves efficient refrigeration and precise temperature control by utilizing the heat absorption during liquid nitrogen vaporization. The system features a double-layer vacuum insulation structure, providing excellent thermal insulation and temperature uniformity. The wet-type design maintains vapor-liquid equilibrium of the liquid nitrogen during operation, effectively avoiding common issues such as temperature drift and frosting, thereby ensuring long-term stability of the experimental environment.​​