During the production process of glass annealing furnace, a large amount of high-temperature flue gas containing rich thermal energy was generated. The utilization of waste heat recovery technology allows for the effective utilisation of this thermal energy, thereby enhancing the efficiency of energy utilization, reducing energy consumption and production costs, and at the same time help to reduce environmental pollution. A method of hierarchical recovery of waste heat from annealing furnace was proposed, which realized a more efficient utilization of waste heat by producing steam and hot water step by step, to obtain better economic and social benefits.