The invention relates a bubble-typed pound automatic aerator, which comprises a motor, flexible tubes and an air pump. The air pump comprises a tube-shaped cylinder and a tube-shaped piston arranged in the cylinder. The tube-shaped cylinder is opened with a gap at one end, and the other end is sealed, an air outlet is opened at the sealed end, and an air outlet valve is arranged on the air outlet. The air outlet is connected with a main flexible tube by an air outlet tube, and the main flexible tube is also connected with a branch organ, a plurality of branch flexible tubes are connected on the branch organ, a shower-shaped nozzle is connected with the end part of the branch flexible tube, and a dobber is tied on the nozzle. The bubble-typed pound automatic aerator is characterized by large amount of supplied air, even distribution of the amount of air, low energy consumption, etc. By the reciprocated movement of the piston, fresh air can be sent to water continually. Meanwhile, the nozzle thereof is placed at the water bottom, thus many small bubbles can be produced, and the bubbles can combine with water fast and closely and dissolve in water, therefore, fast oxygenation can be offered to the rearing ponds, and fishes can obtain continuous enough oxygen.