Differential vortex spinning fancy yarn method

The invention provides a differential vortex spinning fancy yarn method. The differential vortex spinning fancy yarn method comprises the steps that S1, a leather roller of an air-jet vortex spinning machine is replaced with a special-shaped leather roller; the special-shaped leather roller is divided into a first leather roller area and a second leather roller area along the axial direction; s2, the core yarn is unwound from a feeding device, passes through a yarn tension device and a yarn guide device and then is fed into a front roller jaw; drafting the short fiber strands through a drafting mechanism, and converging the short fiber strands with the core yarn at the jaw of the front roller; s3, the core yarn and the short fiber strands pass through a first leather roller area and a second leather roller area respectively, and synchronous feeding and intermittent large and small drafting are carried out in a drafting area; s4, the core yarn and the short fiber strands are sucked into a nozzle; and S5, wrapp