The present invention is an aquarium maintenance unit, which is provided with an extension portion extending upwardly above the aquarium above the casing, the extension portion is provided with a water inlet and a water outlet, and the inlet is provided by the water inlet. A buffer chamber, a pumping pump, a uniform cooling module and a water purification tank are arranged between the water tanks, so that the aquaculture water in the aquarium flows through the components between the water inlet and the water outlet to complete the water purification and cooling. Among them, the buffer chamber can overcome the backflow and siphon phenomenon when the pump is stopped, and can directly generate suction to restore water absorption when restarting operation, overcoming the problem that the traditional circulating water system must manually remove the air in the pipeline to resume operation . The user can simply use the case outside the aquarium for easy use and installation.本創作為一種水族箱維生機組，係於一機殼上方設置一向前凸伸到水族箱上方的延伸部，該延伸部設有一入水口及一出水槽，該機殼內由入水口到出水槽之間設有一緩衝腔、一抽水泵、一致冷模組以及一水質淨化槽，使水族箱內的養殖水流經入水口到出水口之間的各組件後，完成水質淨化及致冷。其中，緩衝腔可以克服抽水泵停止運作時的回流及虹吸現象，並且在重新開始運作時能夠直接產生吸力恢復吸水，克服傳統循環水系統必須以人工排除管路裡的空氣才能恢復運作的問題，讓使用者只需簡易地將機殼擺置在水族箱外部即可使用，達到使用及安裝方便的目的。
