The invention discloses a stepless speed change device used on firecracker braiding equipment and relates to the technical field of firecracker processing machinery. The stepless speed change device comprises a power shaft 11, an output hinge pin 10, an eccentric flange 5, an eccentric roller 6, an eccentric roller shaft 7, a speed-adjusting dynamic disc 9, a speed-adjusting static disc 3, a speed-adjusting disc bearing 15 and a speed-adjusting static disc mounting support strip 1. The stepless speed change device is characterized in that a braiding needle is slightly low in speed in the thread feeding stage, and is relatively fast when quitting, so that the braiding efficiency can be improved. When the stepless speed change device is used in coordination with the firecracker braiding mechanism, firecrackers of various specifications can be braided.