Laboratory fine-grained soil geotextile sieve combined device

The utility model provides a laboratory fine-grained soil combined working sieve. Soil sieving box, characterized in that it is characterized in that it comprises, the soil screening box is a hollow straight quadrangular body defined by three box plates and baffles. The first box plate and the third box plate intersect with the baffle, the side edge of the first box plate is connected with an L-shaped embedding groove, the baffle is fixed relative to the box plates after being inserted into the embedding groove, and fixing bolts are installed on the intersecting sides close to the baffle and the third box plate and used for inserting screws to limit the baffle to be relatively away from and close to the second box plate; multiple layers of inserting screens are sequentially installed on the inner sides of the three box plates from top to bottom, the hole diameters of all the layers of screens are different and are sequentially decreased from top to bottom, the top end of the soil screening box is connected wi