The High-Strength extruded polystyrene board is produced via the closed-cell foaming process of polystyrene, featuring uniform density and compressive strength distribution. Its compressive strength ranges from 300 to 1200 kpa. It boasts a low water absorption rate and a long service life. Its thermal insulation performance remains consistent in both low and high-temperature environments. The low water vapor permeability of High-Strength extruded polystyrene boards effectively minimizes the formation of condensation water inside the cold storage walls. Additionally, these boards offer outstanding thermal insulation as well as water and moisture resistance properties.