The invention discloses an efficient and practical aquarium water filter. The efficient and practical aquarium water filter has the advantages that a grid blocking device with spiral blades beside a water inlet of the water filter can upwards and spirally suck-roll up water at the bottom of an aquarium to be drawn into the water inlet to enter the water filer for filtering to remove sewage, in this way, the sewage in the aquarium can be directly and efficiently sucked in for filtering, so that the water filter is quite efficient and practical.