A protecting device for protecting a cable having a plurality of fibers, includes a conduit which is sleeved on the cable, a distribution member, a first and second clamping members, a first and second fasteners, and a resilient sleeve. The conduit has a first threaded portion on one end of the conduit. The distribution member is being sleeved on the cable, the first clamping member has a plurality of clamping claws for clamping the distribution member; and the first fastener has a restricting portion; the distribution member and the first clamping member are being received in the conduit, the first fastener is engaged with the first threaded portion of the conduit. The plurality of clamping claws of the first clamping member are urged by the restricting portion to tightly clamp the distribution member and the cable.