A washing basket assembly and a tray assembly for a dish-washing machine as well as a dish-washing machine are provided. The washing basket assembly includes a first basket body and a second basket body. The second basket body s disposed to the first basket body and switchable between an opened position and a closed position. When the second basket body is in the closed position, the second basket body and the first basket body are configured to define a receiving cavity having an opening and used for receiving tableware. When the second basket body is in the opened position, a sum of a projection area of the first basket body in a horizontal plane and a projection area of the second basket body in the horizontal plane is larger than the projection area of the first basket body in the horizontal plane.