Screw press

The invention discloses a screw press. The screw press comprises a driving device, a screw component, a water collection box and a pressing pipe, wherein the driving device drives the screw component to rotate, the pressing pipe is connected to a material flow outlet of the screw component, and the water collection box is located at the lower end of the screw component. A feedstock filtering device is connected to a feeding port of the screw component, and a drained water filtering device used for collecting drained water and a slag filtering device used for collecting slag are arranged in the feedstock filtering device. A drained water outlet of the drained water filtering device is connected with the water collection box through a drain pipe. A slag outlet of the slag filtering device is connected to the tail end of the screw component through a slag pipe. The feedstock filtering device is arranged at the feeding port so that sewage and part of large materials or slag can be effectively separated, the situa