Aquaculture wastewater treatment device

The utility model discloses an aquaculture wastewater treatment device which comprises a water suction pump, a microfilter and a photocatalysis assembly, the water suction pump, the microfilter and the photocatalysis assembly are sequentially communicated with a water conveying pipeline, and the photocatalysis assembly comprises a water tank with an opening in the top, an ultraviolet spotlight and a photocatalyst screen plate. The top of the water tank is detachably connected with a cover plate, a water inlet and a water outlet are formed in the side wall of the water tank, the water outlet is close to the top of the water tank, flanges are installed on the water inlet and the water outlet of the water tank and used for being connected with a water conveying pipeline, and the ultraviolet spotlight is installed in the water tank. Guide rails are installed on the two opposite inner side walls of the water tank and extend in the vertical direction, and the two opposite sides of the photocatalyst screen plate are