A water-proof decorative lamp, comprising:
a light source body (100), comprising a light-emitting chip (110) and a packaging body (120), wherein the light-emitting chip (110) is arranged in the packaging body (120) and the light-emitting chip (110) is provided with two pins (130) extending out of the packaging body (120);
connecting wires (200), each comprising a conductive wire (210) and an insulating layer (220), wherein a side wall of the conductive wire (210) is covered with the insulating layer (220), the conductive wire (210) located at one end of the connecting wire (200) protrudes out of the insulating layer (220) to form a connector (211), and the two pins (130) are respectively connected with the connectors (211); and
a water-proof component (300), comprising an isolating column (310) and a sleeve (320), wherein the isolating column (310) is disposed between the two pins (130) so as to separate the two pins (130) from each other and separate the two connectors (211) from each other, one end of the sleeve (320) is arranged around the insulating layer (220) near the connector (211), and the other end of the sleeve (320) is arranged around the packaging body (120) near the pin (130), to cover the connector (211) and the pin (130), the isolating column (310) is made of a hot melting material, and the sleeve (320) is made of a heat-shrinkable material.