The invention provides an energy-saving stove with a protecting function. When air pressure reaches a set value, an air inlet valve is arranged for driving a hollow piston to downward move to compressa return spring; a liquid draining channel on the hollow piston is staggered with a liquid inlet and a draining outlet; the liquid draining channel is closed and fresh air blown by an aeration fan enters a burner for participating in a combustion reaction; when the air pressure is excessively low, the liquid draining channel is communicated with the liquid inlet and the draining outlet and is used for draining liquid entering the air inlet valve, so that the condition that the aeration fan is damaged or the service life of the aeration fan is shortened due to liquid backflow is prevented; athree-way pipe is arranged and the liquid draining channel is positioned below a communicating interface; when the air pressure is excessively low, the communicating interface is closed and the liquiddraining channel is opened; liquid entering the three-way pipe by backflow automatically enters the liquid draining channel under the action of air pressure of the pipeline and is drained, separationof a gas channel from a liquid channel is realized and potential hazards caused contact between the liquid and the aeration fan are avoided.