The invention relates to a converter flue gas energy recovery method, and belongs to the technical field of converter flue gas energy recycling. The invention aims at solving a main technical problem of providing a method with which chemical energy and physical sensible heat in converter flue gas can be comprehensively recycled and also the system can be safer. A basic technical scheme of the invention is that equipment comprising a flue heat exchanger device, a rough dedusting device, a fine dedusting device, an induced draft fan, a pipe network, and a controlling system is adopted. The method is characterized in that a combustion chamber is adopted; and secondary combustion air matching the oxygen demand of variable coal gas entering the combustion chamber is provided for the combustion chamber. The heat exchanger device is also adopted according to the method, and the heat exchanger device is arranged behind the combustion chamber. The method provided by the invention is suitable for the flue gas energy recycling technical field, and provides comprehensive effects of energy-saving, water-saving, safe, investment-saving, and the like.