Preparation method and device for ramie cotton blended yarn

The invention discloses a preparation method and device for ramie cotton blended yarn, including a) carrying out blowing carding process, wherein ramie and cotton in the mass ratio of 10-20:50-80 are put into blowing carding online to carry out the blowing carding process; a vibrating cotton box is arranged on the blowing carding online and a plurality of blow pipes for blowing off staple fibers and sundries are arranged at the head of the vibrating cotton box, b) putting the blended yarn sent out by blowing carding process into a scutcher for blowing process, c) carding, drawing, roving and spun yarn spinning the blended yarn sent out by the scutcher to achieve the ramie cotton blended yarn. Compared with the prior art, the preparation method and device for ramie cotton blended yarn utilize ramie and cotton as a raw material for spinning. The impurity processing is carried out for ramie and cotton in the blowing carding process, thereby being able to improve the stability of the spinning process, fully remov