The invention relates to the development and application of the oil recovery technique, mainly aims at the heating and heat tracing in a lifting process of thickened oil, and especially relates to anintelligent thermal recovery dual-frequency power heating device. The device consists of a three-phase AC power supply, a three-phase isolation transformer, a rectification circuit, a filter circuit,a DC absorption resistor, a control switch, an inversion circuit, and a heating cable for heating a load. The device employs the dual-frequency technology, is high in heating speed, and effectively solves a problem of electrolysis in DC heating.