This creation be a kind of automatic sewage discharging device for being mounted on aquaculture equipment bottom, can focus utilization draining when water flow and hydraulic pressure, without being driven by electricity the dirt that can remove device bottom automatically. The automatic sewage discharging device include: one can be rotated the earth's axis connect what device bottom discharge outlet pipe connecting piece,One socket what pipe connecting piece and radially extend sewage pipe,One is arranged shaft and helical blade in blowdown tube hub,And one group of transmission component and idler wheel for connecing what shaft outboard end； When draining,Concentrate the water flow for entering sewage pipe that helical blade and shaft can be driven to rotate,And idler wheel rotary rolling is driven by transmission component,And then drive whole group blowdown apparatus to rotate centered on discharge outlet in device bottom and advance,Dirt is sucked by sewage pipe when traveling,Device bottom dirt can be made an overall screening with carrying out dynamic.本創作為一種安裝在水產養殖設備底部的自動排污裝置，可集中利用排水時的水流及水壓，無需電力驅動即可自動清除設備底部之污物。所述自動排污裝置包括：一可轉動地軸接於設備底部排水口之管接件、一套接於管接件而徑向延伸的排污管、一設置在排污管中心之轉軸及螺旋葉片，以及一組接於轉軸外側端之傳動組件及滾輪；排水時，集中進入排污管的水流可帶動螺旋葉片以及轉軸旋轉，並且經過傳動組件驅動滾輪旋轉滾動，進而帶動整組排污裝置以排水口為中心在設備底部轉動行進，行進時藉由排污管吸入污物，即可以對設備底部污物進行動態性地全面清理。
