A support assembly is provided and includes an adapter, a stand, and a dish backing structure. The adapter includes two side plates and an upper plate. The side plates are respectively located at the two sides of the adapter. The upper plate is connected to the side plates and has a lower location hole. The stand is connected to the adapter. The dish backing structure has a receiving portion and includes a top wall and two side walls respectively located at the both sides of the receiving portion. The top wall has an upper location hole. When the receiving portion is connected to the adapter, a portion of the top wall abuts against the upper plate, and a gap is formed between the top wall and the upper plate. In addition, the upper location hole is aligned with the lower location hole.