A kind of purification device with what fish and vegetable symbiotic system,Include an outer tube,One drainage cavity,A connecting pipe and a microorganism adhere to medium,The top of the outer tube has a water filling port,The drainage cavity is setting what outer tube,There are the cavity wall of the drainage cavity multiple perforation to be connected to inside and out the drainage cavity,The communicating pipe be by the drainage cavity internal stretch to the outside pipe,And what drainage cavity inside has an opening,The height of the opening is the perforation of the high what drainage cavity,Microorganism attachment medium is that accommodating what outer tube is internal,And the what drainage cavity in position is external； When user fills the water inwardly via the water filling port of outer tube,Water level between position what outer tube and drainage cavity can reciprocally change,Microorganism adheres to the accompanying nitrifier and denitration bacterium of dielectric surface,The total nitrogen in water removal can be ordinatedly removed,And achieve the purpose that purification.一種用於魚菜共生系統之淨化裝置，包含有一外管、一排水腔、一連通管以及一微生物附著介質，該外管之頂端具有一注水口，該排水腔是設置於該外管內部，該排水腔之腔壁具有多個穿孔連通該排水腔的內部及外部，該連通管是由該排水腔內部延伸至該外管外部，且於該排水腔內部具有一開口，該開口之高度是高於該排水腔之穿孔，該微生物附著介質是容置於該外管之內部，且位於該排水腔之外部；當使用者經由外管之注水口朝內注水時，位於外管及排水腔之間的水位會往復地變化，微生物附著介質表面所附著之硝化菌及脫硝菌，可配合地去除水中之總氮，而達到淨化的目的。
