A night lamp includes a lamp that is fitted to a lamp holder, on the lamp holder and in front of the lamp is installed a semi-transparent obstructing plate, in the front of the lamp holder is a light sensitive resistor, in the rear of the lamp holder is a plug that can be inserted into a household power supply socket, the light sensitive resistor on the lamp holder will sense the outside light source, so that it will automatically light on the lamp on the lamp holder; characterized in that at the rear of the lamp holder is a cylinder, on the bottom of its inside are a center contact point and a ring contact point, inside the cylinder is a turning disc, on the turning disc are two conductive pins, the two conductive pins are respectively in contact with the center contact point and the ring contact point; on the bottom side in the cylinder is a jutted point, on the bottom of the turning disc are no less than four equally spaced positioning holes, the jutted point will be accommodated in one of the positioning holes on the bottom of the turning disc, so that the socket will be turned in position and be inserted in a household power supply socket.