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This invention discloses a draining tank and its usage method, relating to the field of solid-liquid separation technology. It includes a tank body, a bottom draining plate, and an end draining plate. The tank body includes a bottom surface, side surfaces, an outer end surface, an inner end surface, an outer end surface baffle, and a liquid outlet. There is a gap between the bottom of the outer end surface and the bottom surface. The outer end surface baffle is sealed and fixed between the bottom of the outer end surface, the bottom surface, and the side surface. The distance from the top of the inner end surface to the top of the side surface is 1 / 3 to 1 / 2 of the side surface height. The distance between the bottom of the inner end surface and the bottom surface is less than 1 / 3 of the side surface height. The end draining plate is installed on the side closest to the outer end surface, and the bottom draining plate is installed between the inner end surface and the end draining plate. The liquid outlet is located below the inner end surface. This invention enables solid-liquid separation of drilling waste using natural ventilation and drainage, solving the technical problems of high production costs, easily broken rock cuttings, easily clogged filter plates, and small single-pass material processing capacity of existing solid-liquid separation equipment.