Abstract: An improved decorative lamp structure, which comprises an outer socket and a connecting sleeve; the outer socket has a socket opening for receiving the connecting sleeve; the lower part of the socket opening is provided with two copper plate channels for mounting two copper plates connected with two power wires respectively; under the copper plate channels, two symmetrical semi-circular slots are furnished on both sides of the guide hole for power wires; the guide hole is used for laying the power wires attached with two copper plates respectively. The two copper plates are to be plugged into the two copper plate channels respectively; the guide hole between the two power wires is to be plugged in with a fixing member having two symmetrical semi-circular slots before the connecting sleeve being plugged in place. The outer surface of the fixing member and the taper surface of the guide hole for power wires are joined together closely so as to prevent rain water from infiltrating into the guide hole.