The invention discloses a chilo suppressalis breeding device. The chilo suppressalis breeding device comprises a moisturizing room, an egg laying cage, a plurality of first egg mass collecting platesand an egg laying cage support, wherein the moisturizing room comprises a room body and a cover, the bottom of the moisturizing room can store moisturizing water, and the moisturizing room is breathable; the egg laying cage can be accommodated in the moisturizing room, the egg laying cage is breathable, and chilo suppressalis is limited in the egg laying cage; the first egg mass collecting platesare arranged in the egg laying cage, and are used for the chilo suppressalis to lay eggs, and the inner space of the egg laying cage is filled with the first egg mass collecting plates; and the egg laying cage support is used for supporting the egg laying cage, so that the egg laying cage is positioned above the water surface of the moisturizing water. By the moisturizing water, the inner environment of the egg laying cage above the moisturizing water can be maintained at required humidity, moreover, the inner space of the egg laying cage is filled with the first egg mass collecting plates, thus, the requirement of irregular egg laying of the chilo suppressalis is met, and the egg mass collecting efficiency is improved. The invention also discloses a chilo suppressalis breeding method.