The condensate wastewater preheater is an efficient device in the fields of industrial wastewater treatment and energy recovery. It adopts a floating head structure design and uses precise heat exchange technology at its core to preheat condensate wastewater by utilizing the residual heat of high-temperature media. The equipment features high heat exchange efficiency and low energy consumption, which can significantly enhance the reaction rate and treatment effect of subsequent processing steps, while also achieving energy recycling. It features a compact structure and stable operation, is suitable for various industrial scenarios, helps enterprises reduce operating costs, and has dual values of environmental protection and energy conservation.