This creation system provides a kind of fish jar moisturizing and changes water installations,It includes: a tube body,The tube body one end for setting what outside fish jar in,The tube body side, which extends, is equipped with branched pipe,The branched pipe is equipped at least one first electrically-controlled valve again; One first groove body,The bottom of its first hollow portion of the tube body other end position what first groove body,Side Pu is equipped in first groove body,The side Pu is connected with tube body one end; One controller,First electrically-controlled valve of the controller and its branched pipe of the tube body with wired or wireless connection,The controller is also electrically connected with the side Pu again; It is equipped with the first groove body by this creation,And heater can be equipped in first groove body,And water can be prestored in advance it is spare,In order to what cut off the water during still can to fish jar replacement water,It can control the water temperature of first groove body simultaneously,And then the too low health for influencing fish of water temperature or existence when can avoid the fish jar moisturizing or changing water,And then this creation can be made to can reach the effect of promoting product applicability and practicability.本創作係提供一種魚缸補水換水裝置,其包含:一管體,該管體一端可供設置於外部的魚缸內,該管體一側延伸設有分支管,又該分支管設有至少一第一電控閥;一第一槽體,該管體另一端位於該第一槽體其第一中空部之底部,該第一槽體內設有幫浦,該幫浦與管體一端相接設;一控制器,該控制器與該管體其分支管之第一電控閥以有線或無線連接,又該控制器也與該幫浦電性連接;藉由本創作設有第一槽體,且該第一槽體內可設有加熱器,而可事先將水預存備用,俾於停水期間仍可對魚缸補換水,同時可控制該第一槽體之水溫,進而可避免該魚缸補水或換水時水溫過低影響魚兒之健康或生存,進而可使本創作可達到提升產品適用性與實用性之功效。