The invention relates to an anti-dryout device for a humidifying tank of a
breathing machine, which belongs to the technical field of medical auxiliary instruments and comprises a humidifying tank, a detection component, a water replenishing
pipe, a water replenishing box and an alarm unit. The water replenishing box is arranged on the outer side of the humidifying tank; the detection
assembly is arranged in the water supplementing box and extends out of the water supplementing box from the interior of the water supplementing box, the heating liquid enables the detection
assembly to abut against the top face of the water supplementing box, and the abutted detection
assembly is connected with the alarm unit in a limiting mode; the water supplementing
pipe comprises a heating end, the heating end is located in the humidifying tank, and the liquid level where an opening of the heating end is located is a warning liquid level; when the real-time liquid level in the humidifying tank is lower than the warning liquid level, the water replenishing box replenishes water to the humidifying tank through the water replenishing
pipe, and meanwhile, the detection assembly detects that the liquid level of the water replenishing box is lowered to drive the alarm unit to give an alarm. And the conditions that the inside of the humidifying tank is still continuously heated, and the conveyed
oxygen is dry and high-temperature to burn a patient are avoided.