The invention discloses a processing device for yarn wrapping. The device comprises a rack, a feeding roller, a drafting roller, a rotation shaft, a rotation disk, a supporting disk, a protective cover and a tensioner, wherein a core yarn coiling drum is disposed on the supporting disk and located in the protective cover; core yarns pass through the tensioner and then penetrates a third yarn guide hole; outer wrapping yarns pass through the feeding roller, then successively pass the center hole of the rotation shaft, a first yarn guide hole and second yarn guide hole and finally wrap the core yarns at the third yarn guide hole; and the wrapped yarns formed after wrapping are drafted by the drafting roller. Through application of the invention, quality of the wrapped yarns is increased, and continuous production is promoted.