The invention discloses a cigarette tow density adjusting device, and belongs to the field of cigarette equipment in the cigarette industry. The device comprises a compaction wheel, an adjusting assembly and a fixing support, the adjusting assembly comprises a connecting frame, an adjusting shaft, a spring and an adjusting wheel, the compaction wheel is rotatably mounted at the upper end of the connecting frame, the fixing support comprises a mounting end face and a fixing end face, the fixing end face is fixedly connected with a filament suction beam fixing seat, and a mounting hole is formedin the mounting end face. The adjusting shaft penetrates through the mounting hole, the upper end of the adjusting shaft is fixedly connected to the lower end of the connecting frame, the lower end of the adjusting shaft is connected with the adjusting wheel, and the spring sleeves the adjusting shaft and is supported between the lower end of the connecting frame and the mounting end face. According to the device, the gram weight deviation of a single cigarette is reduced, the empty end rejection rate of the cigarette is reduced, meanwhile, the residual cigarette amount is reduced, the cigarette index stability is improved, and the factory production and manufacturing level is continuously improved.