The utility model discloses a ceramic tile automatic grader, which is characterized by comprising a frame, a conveying mechanism arranged inside the frame and stack mechanisms respectively disposed on two sides of the conveying mechanism, each stack mechanism is mainly composed of a stack stand, a guide wheel device, a sprocket wheel chain device, a motor, a movement guide wheel and a guide track, the periphery of the guide track is movably equipped with a sliding block, the sprocket wheel chain device is connected with the sliding block which is equipped with a tile holding mechanism, the tile holding mechanism includes a tile holding bracket holder and a tile holding bracket arranged thereon, the end portion of the tile holding bracket holder is hinged with a cam, the surfaces of the cam and the tile holding bracket holder are correspondingly equipped with arc grooves, pins are embedded inside the arc grooves, the pins drive the tile holding bracket holder and the tile holding bracket to rotate around a rotation main shaft of the pins, and the guide wheel device is movably pressed on the cam. The utility model realizes automatic grading and stacking transportation of ceramic tiles with different levels and specification between a product line and a package line, and can convey ceramic tiles conveniently, stably and safely. Further, the utility model saves time and labor and has low production cost.