The invention discloses a soybean screening and cleaning all-in-one machine. The machine comprises a feeding box, a machine box and a cleaning box, a screening plate is arranged below a feeding hole,a collecting plate is arranged below the screening plate, collecting holes are formed in the screening plate, the collecting holes communicate with the upper end of the cleaning box through a first material conveying pipe, a partition plate is obliquely arranged in the cleaning box, a filter screen is arranged below the partition plate, a material falling gap is formed between one higher end of the partition plate and the inner wall of the cleaning tank, the side wall of the cleaning box is connected with a water inlet pipe and an impurity removal pipe, a discharge end of the first material conveying pipe, the water outlet end of the water inlet pipe are located above the material falling gap, a feeding end of the impurity removal pipe is positioned above the lower end of the separation plate, the bottom of the cleaning box is connected with a sewage discharge pipe, a second material conveying pipe is arranged at the bottom of the filter screen, wherein one end of the second material conveying pipe is connected with a drying box, a first valve is arranged on the second material conveying pipe, and a second valve is arranged on the sewage discharging pipe.