The biological fermentation tank is an upward opening structure with heating, automatic temperature control, insulation, and stirring functions; The advantages include fast heat transfer, adaptability to large temperature differences, and easy cleaning. Widely used in industries such as food (dairy) products, pharmaceuticals, daily chemical products, beverages, oils, chemicals, pigments, etc. for heating, mixing, or sterilization treatment. Especially suitable for small and pilot scale use in units and research institutions without steam heat sources. And a fully enclosed structure can be adopted according to the process requirements.