The invention relates to a yarn pipe blowing method and device. A nut cover in penetrating connection with a yarn blowpipe is arranged at the end of the yarn blowpipe; an air flow chamber is formed inthe nut cover; an inner air channel connected with the air flow chamber is formed in the yarn blowpipe; the end of the yarn blowpipe is provided with reverse air holes connected with the air flow chamber; and the inner air channel of the yarn blowpipe, the air flow chamber and the reverse air holes of the yarn blowpipe constitute an air flow, and yarn is assisted in passing through a yarn controlhole to the predetermined position. The yarn pipe blowing method and device have the beneficial effects that the air flow is introduced through the structure of the yarn blowpipe, during bobbin yarnthreading, air blowing is assisted through the air flow, thus the head of the yarn smoothly passes through the slender hole diameter, and the success rate of bobbin yarn threading is guaranteed.