The invention relates to a precipitation technology, particularly to a sewage precipitation apparatus, which comprises a water channel device and a container, wherein the water channel device has a water inlet, a water outlet, a eddy-like water channel and barrier bodies, the barrier bodies are distributed in the eddy-like water channel of the water channel device and are prismatic, the number ofthe barrier bodies is four, and the water channel device is integrally molded. According to the present invention, the technical scheme has characteristics of low cost, flexible application, long service life, no damage, stability and reliability.