Oxygenation water circulating fish tank

The utility model provides an oxygenation water circulating fish tank. The oxygenation water circulating fish tank comprises a tank body, wherein a buffering pond is arranged on the outer side surface of the tank body and is communicated with the tank body through a through hole; a water pump is arranged on the buffering pond; a water feeding end of the water pump is connected with a first sand head via a water feeding tube; the first sand head is parallel to the liquid level in the buffering pond; a half of the first sand head is immerged in water; a water draining end of the water pump is connected with a second sand head via a water draining tube; and the second sand head is placed in the tank body. The buffering pond is utilized skillfully; water circulation in the fish tank is realized by using the water pump; and moreover, the oxygenation water circulating fish tank has an oxygen supply function, is simple in structure and is practical.