The present invention relates to an aquarium having a filtering function so as to facilitate the growth of aquatic organisms such as fish, crustaceans, shellfishes, and aquatic plants. According to the present invention the aquarium having a filtering function is configured to include: a porous horizontal partition wall which horizontally partitions the inner space of the aquarium into an upper growing region and a lower filtering region and a filtering device which is disposed at a predetermined portion of the horizontal partition wall and provided with a filter so as to suction and filter water in the growing region and discharge the water to the filtering region. The water, whose pollutants are filtered using the filtering device, is allowed to move through the pores of the horizontal partition wall from the lower portion to the upper portion of a floor material, such as sand or a functional material, which is stacked on the upper surface of the horizontal partition wall. As a result, pollutants concentrated between the grains of the floor material are floated using the water in the growing region, and the water containing the floated pollutants is absorbed back by the filtering device in order to be filtered.
