A freezer lamp includes a strip lamp holder, a light module, a socket, and a plurality of decks. The light module is disposed in the strip lamp holder. The socket is disposed on the end of the strip lamp holder and electrically connected to the light module. The strip lamp holder includes a main lateral surface and a mounting lateral surface. An installation groove is formed in the main lateral surface along length direction thereof. The light module is received into the installation groove. Two clamping grooves are formed in the mounting lateral surface along length direction thereof and are spaced apart from each other. Each of the decks includes two clamping edges which are spaced apart from each other. The distance between the two clamping edges is exactly equal to that between the two clamping grooves. The clamping edge is cooperating with the corresponding buckle of the clamping groove.