The multifunctional submersible pump of the present invention has multiple functions of water circulation filtration, water pumping and sewage discharge, oxygenation and carbon dioxide refinement, and is suitable for various waterscape tanks. The bottom of the submersible pump is provided with a water inlet, the bottom end of one side wall is provided with a water circulation outlet, the top is provided with a sewage drainage port, and the bottom end of the other side wall is provided with an adjusting knob. The water inlet is connected with a hard hollow tube, and the other end of the hard hollow tube is fixed on the bottom filter plate of the fish tank； the water circulation outlet is equipped with an oxygen-enriching hollow column； the end of the outlet can be sleeved with a simple CO2 (carbon dioxide) refiner. Adjusting the knob to rotate left and right can achieve the function of water circulation filtration or pumping sewage, and can adjust the water flow. On the top side of the submersible pump, there is a snap ring where the water family lights are placed. Another function of the present invention is to design the CO2 (carbon dioxide) refiner into a simple combination method to become a simple CO2 (carbon dioxide) refiner. When the ceramic thinner pieces in the refiner are blocked by contamination, the refiner Remove and clean.本發明一種多功能潛水泵，有水循環過濾、抽水排汙、增氧及二氧化碳細化多種功能選擇，適合各種水景缸。潛水泵底部設有一進水口，一側壁底端設有一水循環出水口，頂部設有一污水排水口，另一側壁底端設有一調節旋扭。進水口連接一硬質空心管，硬質空心管另一端固定於魚缸底濾板上；水循環出水口上設有一增氧空心柱；出水口末端可套合一簡易CO2(二氧化碳)細化器。調節旋扭左右旋轉可達成水循環過濾或抽水排汙功能，並可調節水流流量。潛水泵頂部一側，設有一卡環，供水族燈放置。本發明另一功能是將CO2(二氧化碳)細化器，設計成簡易組合方式，成為簡易CO2(二氧化碳)細化器，當細化器內的陶瓷細化片受污染堵塞時，將細化器取下清理。
