Disclosed are a snap-fit structure and an optical fiber splicer using the snap-fit structure. The snap-fit structure comprises a cable retainer and a base, the base being provided with a snap-fit hole, the cable retainer being provided with an ear clip, during assembling, the clip being fitted into the snap-fit hole, wherein a second outer lateral surface is arranged in a rising direction of the ear clip, the second outer lateral surface in the rising direction of the ear clip and a wall surface of the cable retainer forming a wedge smaller at the top and larger at the bottom.