Provided is an insulation isolating device of a low-voltage switch. The key points of the utility model are that the insulation isolating device comprises an insulating panel, that an insulating inclined board and an insulating handle are fixed on one side of the insulating panel, and that the insulating panel is arranged at the outer side of the insulating inclined board. The insulation isolating device has reasonable structure and novel design. The insulating panel, the insulating inclined board, and the insulating handle are insulators and do not generate conductivity to workers. When the insulation isolating device is used, the insulating panel is inserted into a side surface of the low-voltage switch and the insulating inclined board and the insulating handle are forced to face the workers. After manipulation is executed, the insulation isolating device can be detached by pulling outwardly the insulating handle. The insulation isolating device has convenient manipulation and high security and resolves technical problems of poor security and complex repairing process of a product in the prior art.