According to the characteristics of twin-screw extruder's extruded raw materials and the requirements of working conditions, the feeding device of twin-screw extruder should adopt forced metering feeding method to feed the barrel. In the structure of the compulsory metering and feeding device for the twin-screw extruder, the feeding device is like a single-screw extruder working independently, and the screw conveying the raw material is driven by the output shaft of the DC motor through the worm and worm gear reduction box. The rotating speed of the raw material conveyed by the screw and the amount of the conveyed material are determined by the working speed of the twin screw of the twin-screw extruder, the barrel temperature, the melt pressure in the mold for the molded product and the amount of the molded product. The needs can be adjusted at any time. The thread on the threaded rod in the feeding device can be single-end or double-end. Generally, the single-end thread is more commonly used.