The core of the variable-frequency electromagnetic heating system lies in the application of the principle of electromagnetic induction to convert electrical energy into thermal energy. Within the controller, a rectifier circuit converts the 50Hz alternating current voltage into a direct current voltage, which is then converted by a control circuit into a high-frequency alternating current voltage with a frequency ranging from 10 to 22kHz. This high-frequency alternating current voltage f lows through the high-frequency wires wound around the exterior of a non-metallic material pipe. The magnetic lines of force generated inside the rapidly changing magnetic field cut through the metal container inside the non-metallic material pipe, creating countless small eddy currents. This causes the medium (such as water, crude oil, combustible gas, etc.) to heat up quickly, achieving the effect of rapidly heating the medium.