Abstract: A sink straining assembly includes a strainer disposed in a drain outlet of a trough and having multiple through holes defined in the strainer. A stopper is selectively inserted into the strainer for closing the strainer and storing water in the trough. The stopper has a disk formed with a periphery abutting against an inner periphery of the strainer. A plurality of partitions is integrally disposed under a lower part of the disk for abutting the bottom of the strainer. A through hole is defined in the disk and a pulling bar extends through the through hole for selectively closing the through hole. The pulling bar has an enlarged head for selectively closing the through hole. A stub vertically extends from the enlarged head through the through hole in the disk. A spring is compressively sleeved on the stub after the stub extending through the through hole in the disk.