The invention discloses an electric heater of a pressurecontrolled reactor with. Composed of a tube body and aresistance wire, and is characterized in that: a groove is arranged on the inner wall of the pipe body along the spiral direction, the resistance wire is embedded in thegroove. A cross section of the groove in the shape of “U”and “U” shape, between both sides of the upper ends ofthe length of the bottom edge distance than small. Witheasy installation, high production efficiency, safety and reliability, long service life. The utility model.