The invention discloses a lead wire mounting mechanism of molded fireworks. The lead wire mounting mechanism comprises a lead wire dismounting mould cavity, a lead wire dismounting mould head and a lead wire pressing mould head which are correspondingly arranged, wherein the lead wire dismounting mould head and the lead wire dismounting mould cavity are correspondingly distributed at the two sides of a lead wire; the lead wire dismounting mould head is connected with a lead wire dismounting and reciprocating drive assembly; a convex rod drives the lead wire to correspondingly brush and insert into a concave cavity; a lead wire pressing gap is formed between the convex rod and a corresponding part of the concave cavity; parts, which correspond to two end heads of the lead wire, at the two sides of the lead wire dismounting mould cavity are equipped with two angle folding parts; a guide plate is fixedly connected on the upper surface of the lead wire pressing mould cavity; a guide seam slot which corresponds to the lead wire pressing gap in shape is formed in the guide plate; the lead wire pressing mould head is arranged above the guide plate; and the lead wire pressing mould head comprises a pushing-guiding sleeve which corresponds to the lead wire pressing gap in shape. The lead wire mounting mechanism can be used for efficiently and reliably completing lead wire mounting work of the molded fireworks, and processing speed of the lead wire mounting mechanism is adaptive to and matched with other processes in large-scale assembly line production of the molded fireworks; and parts are matched and coordinated smoothly to protect the lead wire, so that lead wire mounting quality is greatly improved.