The design of magnetic sealed flue check valve originated from aviation technology. The magnetically sealed flue check valve consists of a valve body and a valve plate installed at the valve port of the valve body. Characterized in that a magnet attracting component is arranged on the valve plate corresponding to the edge of the valve port of the valve body, and a sealing rubber ring is arranged on the valve plate corresponding to the valve port. The magnetic force of the magnet adsorption component can ensure the smooth blowing of the valve plate of the range hood and ensure sufficient sealing force. Don't worry, it's strictly tested. As the magnet adsorption component is added between the valve plate and the valve body, the valve plate and the valve body can still be tightly closed under the influence of static pressure and negative pressure in the flue, which significantly enhances the check effect, and 100% sealing completely eliminates the smoke smell in the kitchen.