Cooling device of pinch roll and using method of cooling device

The invention provides a cooling device of a pinch roll and a using method of the cooling device, and belongs to the field of pinch roll cooling devices. The cooling device comprises a spraying head used for spraying a cooling agent to the pinch roll, the pinch roll comprises a roll ring, the spray range of the spraying head completely or partially covers the pinch roll, the spraying head sprays the cooling agent towards the position behind the contact point of the roll ring and a rolled piece in the rotating direction of the roll ring, and the cooling agent is completely vaporized under the action of the pinch roll. The above cooling device is provided in the using method. The using method comprises the following steps that the spraying amount of the cooling agent of the spraying head is adjusted, and when the cooling agent cannot be completely vaporized by the pinch roll, the spraying amount is reduced. When cooling of the pinch roll is insufficient, the spraying amount is increased. The cooling device can