Ultrathin marker lamp

An ultrathin marker lamp is characterized by comprising a shell, a light guide plate and a circuit board, the light guide plate and the circuit board are arranged in the shell, a light-emitting position and a plate placing position are arranged in the shell, the light guide plate is arranged in the light-emitting position, the circuit board is arranged in the plate placing position, and the width of the section of the light-emitting position and the width of the section of the shell are smaller than the width of the section of the plate placing position and the width of the section of the shell. The light guide plate is placed in the light-emitting position, the circuit board is placed in the plate placing position, the section width of the light-emitting position and the shell is matched with the thickness of the light guide plate, the thickness of the shell is not related to the thickness of the light guide plate, the circuit board can be installed, even the thinner light guide plate can be installed in the