Device and method for preparing tubular down yarn

The invention discloses a device and a method for preparing tubular down yarns. The device comprises a down feather feeding device, an electrostatic processing device, a tubular forming device and a twisting and winding device. The method comprises the following steps: feeding down feather into a down feather feeding quantitative output hopper, and quantitatively outputting the down feather to an electrostatic treatment device; the voltage of the electrostatic treatment device is set, electrostatic treatment is conducted on the down feather, and the down feather is linearly arranged; starting the static electricity eliminating device to remove static electricity on the down feather to obtain the down feather which is arranged in a linear shape; down in linear arrangement serves as a covering yarn raw material, tubular down yarn is obtained through wrapping of the tubular forming device, and the tubular down yarn is twisted and wound through the twisting and winding device. The prepared tubular down yarn can b