The invention relates to a device for improving the single thread strength by a high-frequency needling method, which comprises a drafting mechanism and is characterized in that the front side of the drafting mechanism is provided with a needling type fiber entangling mechanism; the needling type fiber entangling mechanism consists of an upper fiber entangling mechanism and a lower fiber entangling mechanism; the upper fiber entangling mechanism comprises a needling mechanism; the lower fiber entangling mechanism comprises a roller with a hole; the roller with the hole is arranged below the needling mechanism; and the front side of the needling type fiber entangling mechanism is provided with an advanced roller pair consisting of an advanced upper leather roller and an advanced lower roller. By the device, the yarn strength after fiber strands are twisted can be improved so that yarns have capability of bearing subsequent severe friction; meanwhile, the required twisting coefficient can also be effectively reduced and the production efficiency is effectively improved. The device for improving the single thread strength by the high-frequency needling method has the characteristics of simple structure, stability and reliability in operation, convenience for reforming on the original spinning frame, low cost and easiness in popularization.