External culture water filter with UV sterilizer

The utility model relates to an external culture water filter with a UV sterilizer. Water flows from a water inlet into a filter box body under the drive of a diving pump, and the filtered water flows out of a water outlet. The filter box body is divided by water stop sheets into two or more filter cavities and one pure water storage cavity. The cavities are communicated with each other zigzaggedly. Each filter cavity is divided into a plurality of filter chambers by water leakage plates. An ultraviolet sterilizing apparatus is installed in the pure water storage cavity. The structure with a plurality of filter chambers and the design prolonging the water flow path of the utility model greatly improve the filtration effect of culture water. The utility model also has the function of ultraviolet sterilization, and is a multifunctional practical external filter for installation.