This creation system provides a kind of water temperature in aquarium arrangement for detecting, comprising: a water temperature monitoring unit has a water entering section, an outlet part and one warns unit； And a power supply unit, it is coupled with the water temperature monitoring unit, with power supply needed for providing the water temperature monitoring unit； Wherein, which sets one aquarium of what, which penetrates the outlet part through water temperature monitoring from aquarium water suction Hou again and discharge water to the aquarium, and when the water temperature of the aquarium is raised and lowered up to a threshold value, which can propose to warn. Thereby user only need to try the water temperature for reducing or increasing aquarium, effectively stablize the ecology of aquarium according to the instruction for unit of warning.本創作係提供一種水族箱水溫偵測裝置，包括：一水溫偵測單元，其具有一進水部、一出水部及一示警單元；以及一供電單元，其與該水溫偵測單元耦接，以提供該水溫偵測單元所需之電源；其中，該水溫偵測單元設於一水族箱，該進水部自該水族箱吸水後經水溫偵測再透過該出水部出水至該水族箱，當該水族箱之水溫升高或降低達一門檻值時，該示警單元會提出示警。藉此使用者只需依照示警單元的指示，設法降低或升高水族箱的水溫，有效穩定水族箱之生態。
