The heating pipe is made up of a heating wire in a seamless metal pipe (carbon steel pipe, titanium pipe, stainless steel pipe, copper pipe), and the gap portion is filled with a magnesium oxide powder having good thermal conductivity and insulation, and then processed into a shrink tube. Various shapes required by the user. The utility model has the advantages of simple structure, high thermal efficiency, good mechanical strength and good adaptability to harsh environments. It can be used for heating various liquids and acid-base salts, as well as for metal melting and melting at low melting point (lead, zinc, tin, babbitt). Users can provide drawings for special design and processing.