In order to improve the heating efficiency of the electric heating system of heavy oil wells,and change current situation of energy waste caused by manual experience control and inefficient automatic control at oilfield site,a heavy oil electric heating control device was researched and proposed.Based on the non-embedded oil well production electric signal,the electric power of the heavy oil production motor was used as the closed-loop feedback signal to obtain the reference input of the optimal oil temperature.On this basis,through the differential feedback link of the wellhead oil temperature,the temperature hysteresis effect was improved,and the energy-saving control of the output power of the intermediate frequency power supply was realized.Through the design of embedded hardware core circuit modules and the development of main software functions,not only the dynamic control of the electric heating process of heavy oil wells was realized,but also the on-site real-time monitoring of various operating indicators was realized.The test results of the heavy oil production well site show that the heavy oil electric heating control device meets the energy-saving and safe production requirements of oil wells,saving energy consumption by up to 21%,which is equivalent to reducing the emission of about 82.3 t of carbon dioxide.