The structure of the compression frame is basically similar to that of the compression frame, but there are 4 packing heads and 1 set of thread feeding device arranged on it. The packing heads of the waste paper hydraulic baler (4 in total) are the most complicated parts of the whole equipment and the most chained actions. The packing heads of each hydraulic waste paper baler have exactly the same structure and can be interchanged. There are 4 sets of thread feeding devices, each set corresponds to a packing head, and each set includes packing line conveying device and packing line reverse tensioning device. The main rail seat of the waste paper hydraulic baler is mainly composed of two wear-resistant steel rails on the surface. The wheels of the compression frame are guided to run along the outer sides of the two tracks, and hydraulic cylinders that push the compression frame to operate are arranged in them. In addition, there is a complete set of hydraulic stations in addition to mechanical components. It can be seen from the above description that various movements of the waste paper hydraulic baler are completed by fluid power.