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This invention provides a water treatment device for aquaculture, belonging to the field of aquaculture water treatment technology. It includes an ultraviolet (UV) sterilization unit with a sealed water delivery component, used for defoaming and sterilization; a mixing auxiliary component is installed on the sealed water delivery component to improve the sterilization quality of the aquaculture water; a self-cleaning unit is installed inside the UV sterilization unit; and an anti-pressure-locking component is installed on the UV sterilization unit. This invention, by setting up a UV sterilization unit, can achieve negative pressure suction. Combined with the slidably adjustable sealed water delivery component, it can achieve diverted, quantitative, and sealed UV sterilization of aquaculture water, thus improving sterilization quality. This solves the problems of existing aquaculture water treatment equipment being inconvenient for independent sterilization and the interference of large amounts of foam and scum in the water with UV sterilization.