To provide a de-toxifying equipment for PCB mixed-in insulating oil, purifying the PCB mixed-in insulating oil containing impurity without generating waste, waste liquid and drainage to stably de-toxify the PCB mixed-in insulating oil, and also reducing the consumption of metallic sodium.

This de-toxifying equipment for the PCB mixed-in insulating oil includes an oil purifying apparatus 50 for electrostatically adsorbing the impurity in the PCB mixed-in insulating oil and removing the same, wherein the PCB mixed-in insulating oil, the impurity of which is removed or reduced is caused to react with the metallic sodium to de-toxify the PCB. The oil purifying apparatus 50 is provided with a regenerating device 56 including: a water circulation line 72 for supplying wash water to electrostatic adsorbers 55a, 55b; an electrolyzing device 64 for electrolyzing wash water which has washed the electrostatic adsorbers 55a, 55b; and a pressure reducing device 68 for drying the cleaned electrostatic adsorbers 55a, 55b, whereby the electrostatic adsorbers 55a, 55b can be used while being regenerated, and also no waste, waste liquid and drainage are generated.