The diagonal strip groove composite insulation board system is a hollow composite insulation system formed by pouring concrete on the inner side of the diagonal strip groove composite insulation board, connecting the components as a whole, and pouring them together with the concrete. The diagonal strip groove composite insulation board is firmly bonded to the concrete to form a hollow composite insulation system, abbreviated as the diagonal strip groove composite insulation board system. The system system has undergone 80 freeze-thaw resistance tests, achieving insulation and wall durability with the same lifespan. The fire rating of the insulation core material is both A and B, fully meeting customer needs.