Fishpond filtering device

The fishpond filtering device comprises a water tank, and the interior of the water tank is sequentially divided into a filtering area, a clear water area and a sewage treatment area from top to bottom. The water inlet pipe is used for guiding pond water into the filtering area; the coarse filter screen and the fine filter screen are obliquely arranged in the filter area; the back-flushing device is used for back-flushing the sewage filtered by the coarse filter screen and the fine filter screen to the sewage down-flow channel; the sewage slow sinking bin is located in the sewage treatment area and communicated with the sewage downward flowing channel; the sewage buoyancy switch is mounted in the sewage slow sinking bin; the sewage pump is mounted at the bottom of the sewage slow sinking bin; according to the utility model, fine impurities in water in the pond can be fully filtered, dirt can be prevented from being accumulated on the surface of the filter screen by regularly backwashing the surface of the fil