The utility model provides an optical fiber splice, including being used for the sealed plinth of fixing in transformer tank's mounting hole department, the inner of plinth is located transformer tank, and outside the outer end was located transformer tank, the plinth had the center that supplies optic fibre to pass and perforates, be used for making the sealed first sealing washer of complex of optic fibre and plinth. When using, sealing the plinth and fix the mounting hole department at transformer tank perforates in the center that makes optic fibre pass the plinth, and first sealing washercan make the sealed cooperation of optic fibre and plinth this moment, and this optical fiber splice not only has good leakproofness but also can protect the optic fibre integrality, can avoid the transformer tank oil leak, can also prevent that optic fibre from taking place to bend, warp, reduces the light decay. The utility model also provides an impulse transformer who has above -mentioned optical fiber splice.