The inclined tube (plate) sedimentation tank is an efficient combined sedimentation tank designed according to the shallow sedimentation theory, also known as the shallow sedimentation tank. A number of dense inclined pipes or inclined plates are set in the settling area, so that the suspended impurities in the water precipitate in the inclined plates or inclined pipes, and the water flows upward along the inclined plates or inclined pipes, and the separated sludge slides down to the bottom of the pool under the action of gravity, and then is concentrated and discharged. This structure can increase the precipitation efficiency by 50-60% and increase the processing capacity by 2-4 times in the same area. The inclined tube precipitators with different flow rates can be designed according to the test data of the original wastewater, and coagulants are generally added when used.