The invention discloses a rice cover sealing plate device capable of being rapidly detached. The rice cover sealing plate device comprises a rice cover plate, a supporting frame, a magnet, a seal ring and a body cover, wherein a magnet is built in the body cover. According to the specific scheme, the rice cover plate is sleeved with the seal ring, small hooks of the rice cover plate can be sleeved with small square holes of the seal ring, then, the supporting frame is arranged on the rice cover plate in a sleeved mode, small hooks of the rice cover plate can be sleeved with small square holes of the supporting frame, the small hooks are all pressed through a special tool so that the three parts can be integrated, and then the magnet of the rice cover sealing plate device is adhered to a circular sink hole of the rice cover plate. When used in cooperation with a rice cooker, the rice cover sealing plate device is good in sealing performance and convenient to detach. All the parts of the rice cover sealing plate device can be conveniently buckled, can be detached from the body cover immediately, are convenient to install, and can be easily cleaned at any time after rice is cooked.