An air suction protection structure for a microbubble device includes a first throat pipe, a second throat pipe and an air suction pipe. The first throat pipe is provided with a conical opening from which a liquid flow enters the first throat pipe. The liquid flow increases its flow speed after passing through the conical opening. The second throat pipe is communicated with the first throat pipe and located downstream of the first throat pipe, a protection area is arranged on an inner wall of the second throat pipe, and the liquid flow does not contact with an inner wall surface of the second throat pipe within a range of the protection area when passing through the protection area. Meanwhile, the air suction pipe is communicated with the second throat pipe, the air suction pipe is provided with an air suction port connected to the protection area.