Anti-overflow device and pot cover to which anti-overflow device is applied

The invention discloses an anti-overflow device and a pot cover to which the anti-overflow device is applied. The anti-overflow device comprises an air pump, a connecting pipe, a cold air injection pipe, a handle, a microcontroller and an electrode wire. The microcontroller is installed in the handle. The air pump is connected with the connecting pipe, the cold air injection pipe is arranged in the connecting pipe, one end of the cold air injection pipe is connected with an air inlet of the air pump, and the other end of the cold air injection pipe is connected with the pot cover. The end of the handle is connected with the electrode wire, the electrode wire is electrically connected with the microcontroller through a wire, and the air pump is electrically connected with the microcontroller through a wire. A temperature control means different from that of any porridge cooking pot is provided, the temperature of the liquid level is reduced through cold airflow, and therefore the purpose of preventing overflow