The utility model provides a rotation speed adjusting structure of a coiling drum of a yarn wrapping machine, and belongs to the technical field of machinery. The rotation speed adjusting structure of the coiling drum of the yarn wrapping machine solves the technical problem that the rotation speed of a coiling drum of an existing yarn wrapping machine can not be adjusted. The rotating speed adjusting structure of the coiling drum of the yarn wrapping machine comprises a rack, a yarn core and the coiling drum used for coiling the yarn core, wherein a support is arranged on the rack, a driving motor is fixedly arranged on the support and connected with a rotary shaft, the rotary shaft is sleeved with the coiling drum, a crankshaft which abuts against the yarn core and can freely rotate is arranged on the support, one end of the crankshaft abuts against the yarn core on the coiling drum, a conductive block is arranged at the other end of the crankshaft, a metal swing arm is fixedly connected to the conductive block, a resistor track is further arranged in the support, the swing arm makes contact with the resistor track, one end of the resistor track is connected with the driving motor through a wire, and the conductive block is connected with the driving motor through a wire. The rotation speed adjusting structure has the advantage of being capable of adjusting the rotation speed of the coiling drum.