The invention relates to a down lamp. The down lamp comprises a radiator, a light source, a middle ring, a lens and an outer ring. The light source is connected with the radiator through an upper pressing plate and a lower pressing plate. The middle ring is in threaded connection with the radiator. The lens is arranged in the middle ring. The outer ring is connected with the middle ring through a thread. The light emitting face of the light source is located in the lens, magnets are arranged in the inner wall of the outer ring, an iron ring is arranged outside the outer ring, and the iron ring and the outer ring are connected through magnetism of the magnets. By means of the design of the magnets, the color of the down lamp can be changed without screwing down the outer ring, only the iron ring connected to the outer ring through magnetism needs to be replaced, and operation is very convenient.