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In the context of black smelly rivers and urban pollution control, heavy metal pollution of river sediments has attracted widespread attention. Heavy metals can accumulate in the sediment through hydrolysis and complexation, and cause secondary pollution through diffusion and migration. River animals play an important role in river ecosystems, and their feeding, excretion and disturbance activities can have a significant impact on the transport and transformation of heavy metals in the sediment. This paper investigates the effects of river animals on the transport and transformation of Zn, typical heavy metals in the sediment, and evaluates the contamination and risk of the sediment and river animals before and after the experiment.