The utility model relates to an oil recovery technical development uses, mainly adds nice and warm companion heat to what the viscous crude lifted the in -process, especially relates to an intelligence thermal recovery dual -frenquency power heating device, by three -phase AC power supply, three -phase isolation transformer, rectifier circuit, filter circuit, direct current absorber resistor, control switch, inverter circuit with be used for the heating cable of heating load to form. The utility model discloses a dual -frenquency technique, rate of heating is fast, the effectual electrolytic problem of solving the direct current heating.