The invention discloses a black odorous water body treatment device. The black odorous water body treatment device comprises a container main body, a horizontal rotating shaft and a plurality of pressing plates, the pressing plates movably sleeve the horizontal rotating shaft and synchronously rotate along with the horizontal rotating shaft; a sponge component capable of expanding or shrinking isfixedly arranged between the adjacent two pressing plates. Due to the structure, a large quantity of aerobic bacteria and anaerobic denitrifying bacteria propagate on the sponge component, so that thesurplus nutrient in the black odorous water body is effectively removed, the sludge is blocked by the sponge component and is adsorbed on the sponge component when the sludge mixed in the black odorous water body flows and passes through the sponge component, the sludge adsorbed on the sponge component is released and falls off from the bottom part of a cavity when the adjacent two pressing plates press the sponge component, and the purpose of removing the sludge mixed in the black odorous water body is achieved.