The utility model provides a modified and spiral expression dewatering integrated device of mud, including dewatering equipment and mixing apparatus, dewatering equipment is including dewatering equipment actuating mechanism, main body frame, feeder hopper, screw rod, screw rod blade, back pressure device, filter drum, rack, outlet and pai nikou, mixing apparatus including mixing apparatus actuating mechanism, barrel, discharge gate, (mixing) shaft, stirring rake, advance the mud mouth and advance the medicine mouth, dewatering equipment places under mixing apparatus, is connected as an organic wholely between the feeder hopper and discharge gate phase -match, main body frame and barrel through the foot rest. The utility model provides a pair of modified and spiral expression dewatering integrated device of mud, compact structure, area is few, can carry out the dehydration of the mud degree of depth in succession, fast, is applicable to the condition such as the factory's mud of disposing of sewage, river course silt, dangerous solid waste.