there is a slot 13 at the rear of the first clamp handle part 12 a second clamp handle part 2 has a front of the second clamp handle part 21 and a rear of the second clamp handle part 22 a cavity 50 is disposed at the front of the second clamp handle part 21 the rear of the second clamp handle part 22 has a movable part 23 of the slot 13 of the corresponding rear of the first clamp handle part 12 the movable part 23 of the rear of the second clamp handle part 22 and the slot 13 of the rear of the first clamp handle part 12 push against each other a connecting piece 3 connects the second clamp handle part 2 and the first clamp handle part 1 moreover the connecting piece 3 is a deformable component when user exerts a clamping force thereon a cutting piece 4 includes a blade base 41 and a blade 42 the blade 42 is installed on the blade base 41 the cutting piece 4 is installed in the cavity 50 when applying external forces 54 55 to the rear of the first clamp handle part 12 and the rear of the second clamp handle part 22 the movable part 23 of the rear of the second clamp handle part 22 will start to displace along the slot 13 of the rear of the first clamp handle part 12 stress the connecting piece 3 and cause it to deform the front of the first clamp handle part 11 and the front of the second clamp handle part 21 will displace reversely from each other and.