A water spraying apparatus of a dishwasher comprising: 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, characterized in that the connecting device comprises first semicircular fitting ring and second semicircular fitting ring 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; the first semicircular fitting ring is provided with a first snapping tongue and a first backstop rib, and the second semicircular fitting ring is provided with a second snapping tongue snap-fitted with the first backstop rib and a second backstop rib snap-fitted with the first snapping tongue; the first snapping tongue is disposed on a peripheral surface of the first semicircular fitting ring and adjacent to an engaging surface of the first semicircular fitting ring with the second semicircular fitting ring, and the second snapping tongue is disposed on a peripheral surface of the second semicircular fitting ring and adjacent to an engaging surface of the second semicircular fitting ring with the first semicircular fitting ring; the first semicircular fitting ring is further provided with a first positioning protrusion and a first positioning recess which are located on an engaging surface of the first semicircular fitting ring with the second semicircular fitting ring; and the second semicircular fitting ring is further provided with a second positioning protrusion and a second positioning recess which are located on an engaging surface of the second semicircular fitting ring with the first semicircular fitting ring; wherein the first positioning protrusion is fitted with the second positioning recess, and the first positioning recess is fitted with the second positioning protrusion, the first positioning protrusion and second positioning protrusion are centrosymmetric with respect to an axis of the connecting ring. 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, characterized in that the connecting device comprises first semicircular fitting ring and second semicircular fitting ring 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; the first semicircular fitting ring is provided with a first snapping tongue and a first backstop rib, and the second semicircular fitting ring is provided with a second snapping tongue snap-fitted with the first backstop rib and a second backstop rib snap-fitted with the first snapping tongue; the first snapping tongue is disposed on a peripheral surface of the first semicircular fitting ring and adjacent to an engaging surface of the first semicircular fitting ring with the second semicircular fitting ring, and the second snapping tongue is disposed on a peripheral surface of the second semicircular fitting ring and adjacent to an engaging surface of the second semicircular fitting ring with the first semicircular fitting ring; the first semicircular fitting ring is further provided with a first positioning protrusion and a first positioning recess which are located on an engaging surface of the first semicircular fitting ring with the second semicircular fitting ring; and the second semicircular fitting ring is further provided with a second positioning protrusion and a second positioning recess which are located on an engaging surface of the second semicircular fitting ring with the first semicircular fitting ring; wherein the first positioning protrusion is fitted with the second positioning recess, and the first positioning recess is fitted with the second positioning protrusion, the first positioning protrusion and second positioning protrusion are centrosymmetric with respect to an axis of the connecting ring.