Automatic screen changer for plastic extrusion

The utility model relates to the technical field of plastic extrusion automatic screen changers, in particular to a plastic extrusion automatic screen changer which comprises a bottom plate, a left shell is fixed to the top face of the bottom plate, a sliding groove is formed in the top face of the bottom plate, two sliding blocks are slidably connected into the sliding groove, and an annular plate is fixed to the top face of the sliding block on the left side. The driving assembly can drive the annular plate and the right shell to move rightwards, then the annular plate is separated from the left shell and the right shell, at the moment, the filter screen on the inner side of the annular plate rotates to complete replacement, friction cannot be generated between the filter screen and the left shell and between the filter screen and the right shell in the rotating process, and then abrasion cannot be generated; the driving assembly drives the annular plate and the right shell to move leftwards, so that the le