A water spraying apparatus of a diswasher and the diswasher comprising the water spraying apparatus are provided. The water spraying apparatus comprises a water source connecting pipe having a water outlet tube, a spraying arm having a water inlet tube, and a connecting device connecting the water source connecting pipe with the spraying arm, in which the connecting device comprises first and second semicircular fitting rings which are adapted to snap-fit with each other to form a connecting ring, the connecting ring is rotatably fitted over the water outlet tube of the water source connecting pipe and positioned in an axial direction of the connecting ring between the water inlet tube of the spraying arm and the water outlet tube of the water source connecting pipe.