The invention discloses a yarn pressing mechanism for core-spun yarn production. The yarn pressing mechanism comprises a lower biasing pressing wheel, a case, a pre-folding countering pressing wheel and a first transverse countering pressing wheel. The front lower portion of the case is provided with a working table, and the pre-folding countering pressing wheel is mounted on the position, locatedon the right side of the working table, of the case. The left side of the pre-folding countering pressing wheel is provided with an edge pre-folding board, and the left side of the edge pre-folding board is provided with an edge folding countering pressing wheel. A bracket is arranged on the left side of the edge folding countering pressing wheel, and an upper pressing wheel is arranged above thefirst transverse countering pressing wheel. The left side of the first transverse countering pressing wheel is provided with a second transverse countering pressing wheel, and the left side of the second transverse countering pressing wheel is provided with an edge folding frame. The left side of the edge folding frame is provided with a third transverse countering pressing wheel, the left side of the third transverse countering pressing wheel is provided with the lower biasing pressing wheel, and the left side of the lower biasing pressing wheel is provided with an upper biasing pressing wheel. According to the yarn pressing mechanism, through arrangement of the lower biasing pressing wheel, the case, the pre-folding countering pressing wheel and the first transverse countering pressingwheel, the problems that during yarn pressing of a traditional yarn pressing mechanism, yarn wrapping is uneven, and the working efficiency is low are solved.