Forced conveying device with mixing function is one of the important equipment in plastic extrusion production line. The device adopts a screw with left and right rotation, driven by a deceleration motor. The materials at both ends of the screw are simultaneously transported to the middle of the screw by utilizing the conveying mechanism of the screw thread. When the materials transported in the left and right directions merge in the middle of the screw, some materials are forcibly transported to the processing equipment through the material conveying port which is in the middle of the mixing bin. Thus realizing the forced conveying function of the materials.