uPVC window corner-cleaning machine is specially used to clean weld seams on uPVC windows and doors, and it is one of major uPVC window machines. After uPVC profiles are heated, melted, and welded to form window frames or sashes, of which there will be weld seams (weld beadings) on the corners. Cleaning these weld seams with a corner-cleaning machine will not only ensure the beautiful outfit of uPVC windows, but guarantees the weld strength and increases the productivity of uPVC windows and doors.