The culture medium is heated continuously, kept warm and cooled by a special disinfection device outside the fermentation tank, and then enters the fermentation tank for sterilization. With the trend of large-scale equipment and automation in fermentation engineering, it is necessary and wise to apply the continuous disinfection process of medium in large-scale fermentation. The energy-saving and efficient continuous fire extinguishing system adopts jet heating + plate heat exchange recovery process, which can be customized according to the actual needs of users.