Christmas tree decoration lights and connection method

Christmas tree decoration lights, comprising a first-level connecting structure, a second-level connecting structure, a third-level connecting structure and connecting wires,

• wherein a head end and a tail end of the second-level connecting structure are connected with the first-level connecting structure and the third-level connecting structure, respectively;
• the first-level connecting structure comprises a first-level main plug, and a first-level branch plug, the second-level connecting structure comprises a second-level main plug and a second-level branch plug, and the third-level connecting structure comprises a third-level plug and lamp tubes;
• the first-level connecting structure and the second-level connecting structure are connected with the second-level main plug through the first-level branch plug, and the second-level connecting structure and the third-level connecting structure are connected with the third-level plug through the second-level branch plug;
• a fool-proofing groove is formed on a bottom end of a connection port of a second-level branch plug body, the third-level plug is arranged at a connection end of the third-level connecting structure, a fool-proofing hole is formed on a bottom end of a connection port of a third-level plug body, and the fool-proofing hole is matched with the fool-proofing groove;
• and
• the second-level branch plug body has a connecting cavity inside, at least one inner convex ring is arranged on an inner wall of the connecting cavity, the third-level plug body comprises a connecting body, at least one outer convex ring is arranged on an outer side of the connecting body, the at least one inner convex ring and the at least one outer convex ring are in snap-in connection when they are inserted for connection, a lower side of the connecting body of the third-level plug body is a concave surface, a sealing ring is arranged on a tail end of the connecting body, and the sealing ring forms a ladder with the concave surface of the connecting body of the third-level plug body;
• and a sealing cavity is reserved at an outer end of the fool-proofing groove, and when the second-level branch plug is plugged and connected with the third-level plug, the sealing ring is matched with the sealing cavity to form a sealing structure.