Dishwasher and spray arm assembly thereof

The invention relates to the technical field of kitchen appliances, in particular to a dishwasher and a spray arm assembly thereof, and aims to solve the technical problem that the washing effect is influenced by large frictional resistance when a spray arm in the existing dish washer rotates. To this end, the dishwasher and spray arm assembly thereof, provides the spray arm assembly for the dishwasher, wherein the spray arm assembly comprises a spray arm seat and a support seat. The support seat is connected with the spray arm seat. The first spray arm sleeves the supporting seat and communicates with the spray arm seat. The first bearing comprises a first sliding ring and a second sliding ring which can slide relative to each other, the first sliding ring is arranged on the first spray arm, the second sliding ring is arranged on the support seat, and the first spray arm can rotate relative to the spray arm seat through the first sliding ring and the second sliding ring. The first spray arm in the spray arm