An optical fiber fusion splicer comprising a fusion splicing part , wherein the fusion splicing part can splice optical fibers, wherein the optical fiber fusion splicer further comprises: a first clamping part respectively provided on either side of the fusion splicing part , wherein the first clamping parts can clamp optical fibers and move in the lengthwise direction of the optical fibers; a cutting part respectively provided on either side of the fusion splicing part , wherein the cutting parts is arranged between the first clamping parts and the fusion splicing part and provided with cutting blades suitable to cut optical fibers and second clamping parts; the second clamping parts are arranged between the cutting blades and the fusion splicing part ; wherein the cutting parts can move, so that the cutting parts withdraw from positions between the first clamping parts and the fusion splicing part , characterized in that the optical fiber fusion splicer comprising a working platform and the fusion splicing part provided on the working platform , and the second clamping part of each of the cutting parts comprises a second fixed part and a second moving part , wherein each of the cutting parts is provided with a driving part, which drives the cutting blade to move towards or away from the second fixed part ; the cutting blade is connected to the second moving part via an elastic part; when the elastic part is in an extended state, the second moving part is closer to the position where the optical fiber is located than the cutting blade ; and when the elastic part is compressed and contracted as the second moving part is in contact with the second fixed part , the cutting blade can continue to move towards the position where the optical fiber is located so as to contact the optical fiber. a first clamping part respectively provided on either side of the fusion splicing part , wherein the first clamping parts can clamp optical fibers and move in the lengthwise direction of the optical fibers; a cutting part respectively provided on either side of the fusion splicing part , wherein the cutting parts is arranged between the first clamping parts and the fusion splicing part and provided with cutting blades suitable to cut optical fibers and second clamping parts; the second clamping parts are arranged between the cutting blades and the fusion splicing part ; wherein the cutting parts can move, so that the cutting parts withdraw from positions between the first clamping parts and the fusion splicing part , characterized in that the optical fiber fusion splicer comprising a working platform and the fusion splicing part provided on the working platform , and the second clamping part of each of the cutting parts comprises a second fixed part and a second moving part , wherein each of the cutting parts is provided with a driving part, which drives the cutting blade to move towards or away from the second fixed part ; the cutting blade is connected to the second moving part via an elastic part; when the elastic part is in an extended state, the second moving part is closer to the position where the optical fiber is located than the cutting blade ; and when the elastic part is compressed and contracted as the second moving part is in contact with the second fixed part , the cutting blade can continue to move towards the position where the optical fiber is located so as to contact the optical fiber. <EOS>