The invention provides a rotating mechanism and a clamping and rotating device and a clamping, rotating and shredding device for a filament tube kit. When the rotating mechanism is in use, the horizontal distances between first runners and a gear ring are adjusted, and the vertical distances between second runners and a connecting plate are adjusted; a gear rotates to drive the gear ring to rotate, and the axial rotating direction of the gear is limited through the first runners; and the connecting plate on the gear rotates along with the gear, and the second runners and third runners are correspondingly used for limiting the upper end and the lower end of the connecting plate. A sleeve is clamped by an empty barrel clamping device, the upper end of a filament is fixed and adjusted by a filament clamping device, and feeding of a filament sleeve is realized; then the clamping and rotating device of the filament sleeve is rotated to a filament cutting mechanism, and the lower end of the filament is cut; the clamping and rotating device is re-rotated by a certain angle, and the filament sleeve is discharged; and meanwhile, other side surfaces of the clamping and rotating device of the filament sleeve are sequentially subjected to clamping feeding, shredding and discharging of the filament sleeve, and the steps are performed simultaneously.