Disclosed are a lamp adapter including a shell and a polar socket component for splicing and electrically connecting two adjacent lamps. The polar socket component is disposed in the shell, and a male head and a female head of the polar socket component are positioned on a first side of the shell and a second side of the shell, respectively; the first side and the second side are positioned on two sides in an X-axis direction or two sides in a Y-axis direction of the shell. According to the present invention, two adjacent lamps are electrically connected with neat appearance, improved safety, and a stable structure.