A micro-axicon was designed and fixed at the end of single core fiber to extend its light transmission distance. The effectiveness of the micro-axicon was verified through simulation and experiment. Simulation and experimental results indicated that compared to a flat end, the divergence angle of effluent light could be reduced from 4.1° to 0.47°, and an increase of 80μm could be achieved using the micro-axicon fixed at fiber end in the light transmission distance of single core fiber. The stability of light beam was improved by 97% using the micro-axicon. It was therefore concluded the micro-axicon fixed at the fiber end was effective in extending the light transmission distance of single core fiber.