The invention relates to the field of fuses, and discloses a mounting error prevention circuit breaker structure. According to the mounting error prevention circuit breaker structure provided by the invention, the thickness of an existing available fuse wire is limited by a gap between a first caliper and a second caliper in a moving clamping part, so that a mounting worker can distinguish the thickness of the existing available fuse wire in a mounting process and mount a proper fuse wire, and normal work of the fuse is guaranteed.