In the field of modern industrial waste disposal, the recycling of used lead-acid batteries has always been an important and challenging task. Rotary furnace technology, as an efficient and environmentally friendly processing method, is gradually becoming a core solution in this field. The rotary furnace separates and extracts lead, plastic, and electrolyte from used lead-acid batteries through a high-temperature smelting process. Its unique design allows the furnace body to rotate at a constant speed, ensuring uniform heating of the materials and complete chemical reactions, which greatly increases the metal recovery rate and reduces energy consumption. At the same time, the closed system can effectively control the emission of harmful gases and meet strict environmental protection standards. This technology not only realizes resource recycling and reduces the dependence on primary lead mines, but also brings significant economic benefits to processing enterprises. With the global emphasis on sustainable development and circular economy, the rotary furnace will surely play an increasingly important role in the used battery recycling industry.