The utility model provides an improve device of optic fibre proof strength and coating concentricity, including wire drawing stove and main drive wheel, and position measuring instrument, be close to the setting of wire drawing stove end opening for measure the bare fibre positional deviation, automatic adjusting device, installation on it the coating mould, the PLC machine is connected with automatic adjusting device for it needs the direction and the numerical value of offset and angular deflection to calculate the coating mould, and controls automatic adjusting device drive coating mould horizontal migration and angular shift, the wire drawing stove is central, position measuring instrument is central and coating mould center is in same vertical on -line, and the straight line at three center place is taken turns tangently with the main drive. The utility model discloses can make the bare fibre under any circumstance all pass through from the center in the mould hole that coats wire pair the coat position or the angle adjustment of mould to reduce the bare fibre by the probability of last mould mouth grazing, thereby optimize the proof strength of optic fibre and scrap, also improved the coating concentricity of optic fibre simultaneously.