The utility model relates to the technical field of tailing grading filtering, and discloses a grading filtering device for tailing disposal, which comprises a base, a lifting mechanism is arranged at the top of the base, a grading filtering mechanism is arranged at the top of the lifting mechanism, and the grading filtering mechanism comprises a grading assembly and a filtering assembly. The grading assembly is arranged on the top of the lifting mechanism, and the filtering assembly is arranged in the grading assembly. When the filter screen cylinder rolls, the tailings are in contact with the filter screen cylinder, and the density of meshes of the filter screen cylinder is increased from right to left, so that the tailings with smaller sizes are graded and fall into the bottom discharge chute; and in the rotating process of the filter screen cylinder, the threaded shaft tailings can be driven to move through the rotating direction of the spiral blades, and finally the tailings are filtered, so that the tailings can be graded in sequence from small to large, the working progress is shortened, and the working efficiency is improved.