The invention discloses an automatic yarn hanging and cutting system for a horizontal type fiber winding machine. The automatic yarn hanging and cutting system mainly comprises a rack, a box body, a yarn tying device, a trolley device, a yarn pressing device, a yarn clamping device, a yarn shearing device and a tension control module. The rack is provided with the box body, the yarn tying device and a guide rail arranged in the horizontal direction. The trolley device is mounted on the guide rail and moves back and forth in the length direction of the guide rail. The yarn pressing device, theyarn clamping device, the yarn shearing device and the tension control module are all arranged on the trolley device. A core mold of the horizontal type fiber winding machine is arranged on the yarn tying device. The axis direction of the core mold is parallel with the length direction of the guide rail. The automatic yarn hanging and cutting system has the beneficial effects that the yarn pressing device, the yarn clamping device and a yarn shearing structure are all arranged on the trolley device, the yarn pressing, yarn clamping and yarn shearing processes are not limited by the position ofa trolley, and no matter which position the trolley device moves to, yarn pressing and yarn clamping can be conducted; and when a winding command is ended, yarn shearing can be conducted, and flexibility of the automatic yarn hanging and cutting system is improved.