The present invention relates to a micro-bead filtration device which is a kind of biofiltration tank for a circulating filtration farm, and the filtration device is composed of a filtration tank, a plurality of fine beads, and a rotary spray device.;Filtration device according to the present invention is easy to manufacture and requires less installation place, not only because of the excellent filtration capacity because of the use of fine beads, the installation cost and operating cost is very cheap compared to the existing filtration device, and thus economical, When installed in overfish farms or in general farms, a small investment can significantly improve fish productivity. In addition, the spray device can be used regardless of the size of the filtration tank because the spray device can be driven inefficiently by the spraying force of the water and evenly spray the water to be filtered into the filtration tank. Therefore, even when used over a long time there is an advantage that wear or failure does not occur well.;Fine bead filtration, rotary spray, fish circulating filtration
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