The utility model relates to a heat exchanger, in particular to the heat exchanger for heating refined vegetable oil. The heat exchanger comprises a cylindrical heating container and a coiled pipe arranged in the cylindrical heating container, wherein a heat conduction oil inlet is arranged at the lower part of the right side of the heating container; a heat conduction oil outlet is arranged at the upper part of the left side of the heating container; and a valve is arranged at the bottom of the heating container. The heat exchanger is characterized in that the heat conduction oil outlet is connected with an external heat exchanger box body; a heat conduction oil final outlet is arranged at the lower part of the external heat exchanger box body; and upper connecting pipes and lower connecting pipes are respectively connected between the upper part of the heating container and the upper part of the external heat exchanger box body and between the bottom of the heating container and the bottom of the external heat exchanger box body. The heat exchanger has a unique structure, can be operated at a relatively-low temperature and is safe and reliable; and the heat exchange area is increased, the heat efficiency is improved and the original fragrance of edible oil can be maintained.