The stainless steel mixing tank has an upward opening structure and is equipped with heating, automatic temperature control, insulation, and mixing 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.