A yarn guide of a knitting machine assists a knitting machine to weave a fabric having a yarn ring surface and comprised of a base yarn for forming a base fabric and a wool yarn for forming a yarn ring surface. A needle disc is shifted to enter the wool yarn and the base yarn respectively into a yarn hooking section and a first yarn hooking position of a needle latch. The needle disc continues shifting such that the base yarn is entered into a second yarn hooking position of the yarn hooking section. A knitting needle includes a yarn guide plate on a side so that the first yarn hooking position continues pressing the base yarn by the yarn guide plate. The second yarn hooking position drives the base yarn to weave the wool yarn into the base fabric under a counter wrap knitting status.