This invention provides a twine twister for bobbin-winding and the twine processing method with the twister, which is a muzzle forming vortex field, mounted on bobbin winder. The hairiness passing through yarn can form twine with unique structure, consequently, cop can become twine after bobbin-winding process. The invention shortens consumedly all the flow of producting twine, with simple process, so has a bigger market economic value.