This Study suggests small movable batch treatment system of dredged soil for dredge treatment of deposit soil generated from rain water tube and designed vacuum silo sorting separation device which unitizes particularly vacuum silo, first stage sorting separator and conveyor. The vacuum silo sorting separation device is composed of storage tank, transferring screw, vacuum gate, screen bar, screen bar cleaner and vacuum discharging device. And by conducting mechanical and dynamic simulation of drive mechanism through 3D-CAD modelling determined specifications. Following this study, we will design drum screen type second sorter, decanter type dehydration device and auxiliary devices waste water tank and pump. And based on this design we will make prototype model and carry out field test.