A rotary spray arm for a washing device and a washing device, the rotary spray arm comprises a pair of an upper cover and a lower cover attached to the upper cover; a flow channel disposed between the upper cover and the lower cover, the water outlets are disposed on the upper cover; an upper chamber in communication with the flow channel is formed at a center of the lower cover; the flow channel is located at two sides of the upper chamber, and a hole matching to the upper chamber is formed on a bottom surface of the lower cover. The rotary spray arm is provided with a chamber for accommodating the water outlet portion of the water pump and the chamber is communicated to the water outlets, therefore, the rotary spray arm can be manufactured independently of the water pump, and both processing and mounting are very convenient.
