The invention discloses a full-automatic optical fiber cutting machine. The full-automatic optical fiber cutting machine comprises a feeding device, a tensioning device, a straightening device, a traction device, a cutting device and a material receiving box, wherein the feeding device, the tensioning device, the straightening device, the traction device, the cutting device and the material receiving box are arranged in sequence in the transmission direction of optical fiber. The optical fiber is wound around the feeding device, bypasses the tensioning device, and sequentially passes through the straightening device and the traction device, then is cut off by the cutting device and falls into the material receiving box. According to the full-automatic optical fiber cutting machine, a full-automatic operation mode is adopted, the optical fiber is cut into the optical fiber with required length after the optical fiber is straightened by the feeding device, the tensioning device, the straightening device, the traction device, the cutting device and the material receiving box in sequence, so that the cutting efficiency and the cutting precision of the optical fiber are improved, the cost is reduced, and the quality is guaranteed; and in the whole process, only coiled material wound with optical fiber needs to be placed manually, labor is greatly saved compared with manual cutting,and one person with more machines can be realized, efficiency is further improved, and labor costs are reduced. In addition, the full-automatic optical fiber cutting machine further has the characteristics of simple structure, high speed, stable quality, convenient adjustment and high universality.