The invention discloses a device for separating micro-plastics from soil, which comprises a shell, a blower, a residue collecting box, a layered multistage screen, a liquid container and an air pump; A feeding hopper is arranged above the casing, and a screen and an oscillating device are sequentially arranged between the feeding hopper and the casing; The air blower is located on one side of the casing and communicated with the hollow cavity of the casing, and the residue collecting box is arranged at the bottom of the casing and close to one side of the air blower and communicated with the hollow cavity of the casing; Layered multistage screen is set in the lower part of the hollow cavity of the casing; The lower part of the layered multi-stage screen is communicated with a liquid container through a pipeline, the liquid container contains saturated salt water, and the pipeline extends to the saturated salt water; The suction pump is communicated with the air containing cavity on the liquid container through a pipeline, so that a sample to be separated, which does not fall into the residue collecting box, can be sucked above the layered multistage screen, and then undersize falls into the liquid container for further separation. The invention has the advantages of simple structure, high separation speed, no need of complicated pretreatment of the sample, and small dosage of salt solution.
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