Abstract: An insulation detection device and an insulation detection method for a cooling plate of a battery pack are provided. The device includes a detection position for placing the cooling plate of the battery pack, conductive cotton, a first conductive element, a second conductive element, and an insulation detector. The cooling plate of the battery pack is hollow, and an outer surface of the cooling plate of the battery pack is coated with an insulation coating. The conductive cotton is arranged in the detection position for wrapping the cooling plate of the battery pack. The first conductive element is connected to an inner wall of the cooling plate of the battery pack. The second conductive element is connected to the conductive cotton. A first end of the insulation detector is connected to the first conductive element, and a second end of the insulation detector is connected to the second conductive element.