Multi-stage treatment system for treating fish washing wastewater

The utility model discloses a multi-stage treatment system for fish washing wastewater treatment, which comprises a wastewater conveying box, the lower part of the wastewater conveying box is fixedly connected with a funnel, one side of the interior of the wastewater conveying box is provided with a threaded rod, and the exterior of the threaded rod is in threaded connection with a limiting sleeve. According to the multi-stage treatment system for fish washing wastewater treatment, after liquid is conveyed into the secondary filtering treatment box, a partition plate and activated carbon filter the passing liquid, and meanwhile, solid impurities generated after filtering are conveyed to the right side of the partition plate through the inclined face of the partition plate; meanwhile, a connecting line is installed between the partition plate and the secondary filtering treatment box and drives solid impurities generated after filtering to be protected, the solid impurities are prevented from being accumulated